OFFSET
0,3
COMMENTS
The invariant ring for a 9-dimensional group +-SP_2(9) of order 1440.
LINKS
G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
MAPLE
(Maple code for Molien series:)
u1 := 1 + 2*t^6 + 17*t^8 + 36*t^10 + 89*t^12 + 167*t^14 + 278*t^16 + 428*t^18 + 590*t^20 + 704*t^22 + 760*t^24 + 745*t^26 + 643*t^28 + 504*t^30 + 365*t^32 + 223*t^34 + 118*t^36 + 56*t^38 + 23*t^40 + 6*t^42 + 4*t^44 + t^46;
u2 := (1-t^2)*(1-t^4)*(1-t^6)^4*(1-t^8)*(1-t^10)^2; MS := u1/u2;
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 30 2004
STATUS
approved