177463

Appears in sequences

• a(n) = 1 + 3 * Sum_{k=0..n-1} a(k) * a(n-k-1).at n=6A337167
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) = Sum_{j=0..n} k^j*binomial(n,j)*Catalan(j).at n=51A340968