4670265600domain: NAppears in sequencesa(n) = (n+1) * (2*n)! / n!.at n=8A002690Magic products of 7 X 7 multiplicative magic squares.at n=4A113027Number of leading even entries in all permutations of {1,2,...,n}.at n=12A152665E.g.f. satisfies A(x)^A(x) = 1/(1 - x)^(x^3).at n=13A356911