291318domain: NAppears in sequencesa(n) = (1/24)*(n+1)*(n+6)*(n^3+26*n^2+225*n+636).at n=18A090948Number of (n+4) X 10 0..2 matrices with each 5 X 5 subblock idempotent.at n=14A224623Numbers n such that n = prime(d_1) * prime(d_2) * ... * prime(d_k), where n is a concatenation of d_1, d_2, ..., d_k.at n=8A329711