Triangle T(n, k, q) = e(n, k, q) + e(n, n-k+1, q), where e(n, k, q) = ((1 - (-q)^k)/(1 + q))*e(n-1, k, q) + (-q)^(k-1)*e(n-1, k-1, q), e(n, 0, q) = e(n, n, q) = 1, and q = 3, read by rows.

A156538

Triangle T(n, k, q) = e(n, k, q) + e(n, n-k+1, q), where e(n, k, q) = ((1 - (-q)^k)/(1 + q))*e(n-1, k, q) + (-q)^(k-1)*e(n-1, k-1, q), e(n, 0, q) = e(n, n, q) = 1, and q = 3, read by rows.