21810380800domain: NAppears in sequencesa(n) = binomial(n,3)*2^(n-3).at n=23A001789Theta series of D*_26 lattice.at n=21A022079Coordination sequence for diamond structure D^+_24. (Edges defined by l_1 norm = 1.)at n=15A035888a(n) = 2^n*binomial(n,2).at n=26A100381Expansion of x^4*(5 - 16*x + 13*x^2)/(1 - 2*x)^4.at n=28A268587