OFFSET
0,9
COMMENTS
Conjectured Poincaré series [or Poincare series] for genus 2 Siegel theta series of odd unimodular lattices.
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
Index entries for linear recurrences with constant coefficients, signature (1, 0, 0, 0, 0, 0, 0, 1, -1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, -1, 1, 0, 0, -1, 1, 0, 0, 0, 0, 0, 0, 1, -1).
MATHEMATICA
CoefficientList[Series[(1 + x^18)/((1 - x)*(1 - x^8)*(1 - x^12)*(1 - x^24)), {x, 0, 50}], x] (* G. C. Greubel, Dec 20 2017 *)
PROG
(PARI) x='x+O('x^30); Vec((1+x^18)/((1-x)*(1-x^8)*(1-x^12)*(1-x^24))) \\ G. C. Greubel, Dec 20 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 04 2004
STATUS
approved