12088488

Appears in sequences

• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where A(n,k) is Sum_{j=0..floor(n/2)} ((n-j)!/j!)*binomial(n-j,j)*k^(n-2*j).at n=62A305401
• a(0) = 1, a(1) = 3, a(n) = 3*n*a(n-1) + a(n-2).at n=7A305459