-3583domain: ZAppears in sequencesa(n) = (n^6 - 126*n^5 + 6217*n^4 - 153066*n^3 + 1987786*n^2 - 13055316*n + 34747236)/36.at n=16A121888Expansion of Product_{k>=1} (1 - x^k)^(2*k-1).at n=23A319669