593408domain: NAppears in sequencesa(n) = 2*a(n-1) + 12*a(n-2).at n=9A091914E.g.f. A(x) = Sum_{n>=0} exp(3^n*x)*x^n/n!.at n=6A135079Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = Sum_{j=0..n} k^(j*(n-j)) * binomial(n,j).at n=51A355395