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 if k <= floor(n/2) otherwise 2*(n-k), and m = 3, read by rows.

A157278

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 if k <= floor(n/2) otherwise 2*(n-k), and m = 3, read by rows.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =14a(5) =1a(6) =1a(7) =69a(8) =69a(9) =1a(10) =1a(11) =292a(12) =1134a(13) =292a(14) =1a(15) =1a(16) =1187a(17) =11686a(18) =11686a(19) =1187a(20) =1a(21) =1a(22) =4770a(23) =100737a(24) =254132a(25) =100737a(26) =4770a(27) =1a(28) =1a(29) =19105

External references