683233990

Appears in sequences

• Triangle read by rows: absolute values of odd-numbered rows of A225433.at n=20A225398
• Triangle T(n, k) = T(n, k-1) + (-1)^k*A142458(n+2, k+1) if k <= floor(n/2), otherwise T(n, n-k), with T(n, 0) = T(n, n) = 1, read by rows.at n=40A225433