A285018 - OEIS

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A285018

Denominator of (-1/3)^n*sqrt(Pi)/(Gamma(1/2 - n)*Gamma(1 + n)).

1, 6, 24, 432, 10368, 6912, 248832, 1492992, 23887872, 1289945088, 15479341056, 30958682112, 2229025112064, 13374150672384, 5944066965504, 106993205379072, 10271347716390912, 20542695432781824, 2218611106740436992, 13311666640442621952, 106493333123540975616

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

FORMULA

A285019(n)/a(n) = (-1/3)^n*sqrt(Pi)/(Gamma(1/2 - n)*Gamma(1 + n)).

Sum_{k>=0} A285019(k)/a(k) = sqrt(3/2).

Sum_{k>=0} (-1)^k*A285019(k)/a(k) = sqrt(3)/2.

Sum_{k>=0} (-1)^(k+1)*A285019(k)/a(k) = -sqrt(3)/2.

MAPLE

P:=proc(q) denom((-1/3)^q*sqrt(Pi)/(GAMMA(1/2-q)*GAMMA(1+q))); end:

seq(P(i), i=0..20); # Paolo P. Lava, Apr 10 2017

MATHEMATICA

Denominator[Table[(-1/3)^n*Sqrt[Pi]/(Gamma[1/2-n]*Gamma[1+n]), {n, 0, 25}]]

CROSSREFS

Cf. A285019 (numerators).

Sequence in context: A097171 A152886 A128614 * A139240 A052524 A267032

Adjacent sequences: A285015 A285016 A285017 * A285019 A285020 A285021

KEYWORD

nonn,frac

AUTHOR

Ralf Steiner, Apr 08 2017

STATUS

approved