44451550

Appears in sequences

• Triangle T(n,k) read by rows: T(n,k) = 1 if k=1 or k=n, otherwise T(n,k) = (3*n-3*k+1)*T(n-1,k-1) + (3*k-2)*T(n-1,k).at n=40A142458
• a(n) = A142458(n+5, n). Fifth diagonal of A142458 triangle.at n=4A144381
• a(n) = A142458(n, 1 + floor(n/2)).at n=8A154425