Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m*k + 1)*T(n-1, k, m) + m*f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = 2*k+1 if k <= floor(n/2) otherwise 2*(n-k)+1, and m = 3, read by rows.

A157274

Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m*k + 1)*T(n-1, k, m) + m*f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = 2*k+1 if k <= floor(n/2) otherwise 2*(n-k)+1, and m = 3, read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =17a(5) =1a(6) =1a(7) =84a(8) =84a(9) =1a(10) =1a(11) =355a(12) =1431a(13) =355a(14) =1a(15) =1a(16) =1442a(17) =14827a(18) =14827a(19) =1442a(20) =1a(21) =1a(22) =5793a(23) =127860a(24) =326591a(25) =127860a(26) =5793a(27) =1a(28) =1a(29) =23200

External references