T(j,k) = binomial(j^k,k)/j, j <= m, k <= j, written as triangle T(j,k).

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =12a(5) =975a(6) =1a(7) =30a(8) =10416a(9) =43698160a(10) =1a(11) =60a(12) =63550a(13) =1259394500a(15) =1a(16) =105a(17) =276060a(18) =19500470010a(21) =1a(22) =168a(23) =952413a(24) =197321108600