2508000domain: NAppears in sequencesTheta series of lattice D20+.at n=6A014747Theta series of D_20 lattice.at n=3A022051Theta series of D*_20 lattice.at n=6A022073Expansion of theta_4(q)^20 in powers of q = exp(Pi i t).at n=6A319308a(n) = (4/45)*n*(n - 2)*(n - 1)*(n^3 - 12*n^2 + 47*n - 15).at n=20A319577