OFFSET
0,2
LINKS
G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
FORMULA
G.f. = u1/u2, where f := 1 + 10*x^2 + 40*x^3 + 90*x^4 + 180*x^5 + 340*x^6 + 420*x^7 + 215*x^8; u1 := f+x^16*subs(x=1/x, f); u2 := (1-x)^5*(1-x^2)^6*(1-x^3)^5;
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 05 2004
STATUS
approved