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Expansion of phi(-x^3) * f(-x^6)^3 / f(-x^2) in powers of x where phi(), f() are Ramanujan theta functions.
(history; published version)

#9 by Charles R Greathouse IV at Fri Mar 12 22:24:48 EST 2021

LINKS

M. Michael Somos, <a href="/A010815/a010815.txt">Introduction to Ramanujan theta functions</a>

Discussion

Fri Mar 12

22:24

OEIS Server: https://oeis.org/edit/global/2897

#8 by N. J. A. Sloane at Wed Nov 13 21:58:51 EST 2019

LINKS

M. Somos, <a href="http://somos.crg4.comA010815/multiqa010815.htmltxt">Introduction to Ramanujan theta functions</a>

Discussion

Wed Nov 13

21:58

OEIS Server: https://oeis.org/edit/global/2832

#7 by Joerg Arndt at Fri Jan 05 02:54:08 EST 2018

STATUS

reviewed

approved

#6 by Michel Marcus at Fri Jan 05 01:45:46 EST 2018

STATUS

proposed

reviewed

#5 by G. C. Greubel at Thu Jan 04 22:58:58 EST 2018

STATUS

editing

proposed

#4 by G. C. Greubel at Thu Jan 04 22:58:36 EST 2018

LINKS

G. C. Greubel, <a href="/A263527/b263527.txt">Table of n, a(n) for n = 0..1000</a>

STATUS

approved

editing

#3 by Michael Somos at Mon Oct 19 21:59:17 EDT 2015

STATUS

editing

approved

#2 by Michael Somos at Mon Oct 19 21:59:11 EDT 2015

NAME

allocated for Michael SomosExpansion of phi(-x^3) * f(-x^6)^3 / f(-x^2) in powers of x where phi(), f() are Ramanujan theta functions.

DATA

1, 0, 1, -2, 2, -2, 0, -4, 2, 0, 1, -4, 4, -2, 2, -4, 5, 0, 2, -2, 6, -4, 2, -4, 6, 0, 0, -6, 4, -2, 4, -8, 7, 0, 2, -10, 4, -6, 0, -4, 6, 0, 1, -6, 8, -6, 4, -8, 4, 0, 4, -8, 10, -4, 2, -8, 8, 0, 2, -6, 12, -4, 4, -8, 8, 0, 5, -8, 6, -4, 0, -8, 14, 0, 2, -10

OFFSET

0,4

COMMENTS

Ramanujan theta functions: f(q) (see A121373), phi(q) (A000122), psi(q) (A010054), chi(q) (A000700).

LINKS

M. Somos, <a href="http://somos.crg4.com/multiq.html">Introduction to Ramanujan theta functions</a>

Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/RamanujanThetaFunctions.html">Ramanujan Theta Functions</a>

FORMULA

Expansion of q^(-2/3) * eta(q^3)^2 * eta(q^6)^2 / eta(q^2) in powers of q.

Euler transform of period 6 sequence [ 0, 1, -2, 1, 0, -3, ...].

G.f. is a period 1 Fourier series which satisfies f(-1 / (144 t)) = (2048/3)^(1/2) (t/I)^(3/2) g(t) where q = exp(2 Pi i t) and g() is the g.f. for A263501.

a(n) = (-1)^n * A261444(n). a(8*n + 1) = 0.

a(2*n) = A261426(n). a(4*n) = A263433(n). a(4*n + 2) = A261444(n).

EXAMPLE

G.f. = 1 + x^2 - 2*x^3 + 2*x^4 - 2*x^5 - 4*x^7 + 2*x^8 + x^10 - 4*x^11 + ...

G.f. = q^2 + q^8 - 2*q^11 + 2*q^14 - 2*q^17 - 4*q^23 + 2*q^26 + q^32 + ...

MATHEMATICA

a[ n_] := SeriesCoefficient[ EllipticTheta[ 4, 0, x^3] QPochhammer[ x^6]^3 / QPochhammer[ x^2], {x, 0, n}];

PROG

(PARI) {a(n) = my(A); if( n<0, 0, A = x * O(x^n); polcoeff( eta(x^3 + A)^2 * eta(x^6 + A)^2 / eta(x^2 + A), n))};

CROSSREFS

Cf. A261426, A261444, A263433, A263501.

KEYWORD

allocated

sign

AUTHOR

Michael Somos, Oct 19 2015

STATUS

approved

editing

#1 by Michael Somos at Mon Oct 19 21:59:11 EDT 2015

NAME

allocated for Michael Somos

KEYWORD

allocated

STATUS

approved