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 u1 := f0 + x^30*subs(x=x^(-1), f0); f0 := 1 + 10*x^3 + 25*x^4 + 53*x^5 + 121*x^6 + 247*x^7 + 471*x^8 + 803*x^9 + 1201*x^10 + 1674*x^11 + 2182*x^12 + 2616*x^13 + 2911*x^14 + 1509*x^15; u2 := (1-x)^3*(1-x^2)^5*(1-x^3)^3*(1-x^4)^3*(1-x^6)^2.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 02 2004
STATUS
approved