OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000 (terms 0..1000 from Colin Barker)
J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
Joan Serra-Sagrista, Enumeration of lattice points in l_1 norm, Inf. Proc. Lett. 76 (1-2) (2000) 39-44.
Index entries for linear recurrences with constant coefficients, signature (17, -136, 680, -2380, 6188, -12376, 19448, -24310, 24310, -19448, 12376, -6188, 2380, -680, 136, -17, 1).
FORMULA
G.f.: ((1+x)/(1-x))^17.
a(n) = (2*(638512875 + 4851868680*n^2 + 4215249348*n^4 + 1045091320*n^6 + 99734206*n^8 + 4181320*n^10 + 80444*n^12 + 680*n^14 + 2*n^16)) / 638512875 for n>0. - Colin Barker, Apr 20 2017
n*a(n) = 34*a(n-1) + (n-2)*a(n-2) for n > 1. - Seiichi Manyama, Aug 20 2018
PROG
(PARI) Vec(((1+x)/(1-x))^17 + O(x^30)) \\ Colin Barker, Apr 20 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
EXTENSIONS
Recomputed by N. J. A. Sloane, Nov 25 1998
STATUS
approved