194388

Appears in sequences

• Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused).at n=15A006958
• Triangle read by rows: T(n,k) = T(n-k,k-1) + 2*T(n-k,k) + T(n-k,k+1) with T(0,0) = 1 for 0 <= k <= A003056(n).at n=62A291929