346366domain: NAppears in sequencesa(n) = Sum_{k=0..n} (k+1)^(n-1)*k!*StirlingS2(n,k).at n=5A191908Array read by downward antidiagonals: A(n,k) = Sum_{i=0..n-1} Sum_{j=0..k+1} binomial(n-1,i)*binomial(k+1,j)*A(i,j) with A(0,k) = 1, n >= 0, k >= 0.at n=41A383410