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) = k if k <= floor(n/2) otherwise n-k, and m = 3, read by rows.
A157212
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) = k if k <= floor(n/2) otherwise n-k, and m = 3, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =24a(8) =24a(9) =1a(10) =1a(11) =103a(12) =306a(13) =103a(14) =1a(15) =1a(16) =422a(17) =3028a(18) =3028a(19) =422a(20) =1a(21) =1a(22) =1701a(23) =26064a(24) =57806a(25) =26064a(26) =1701a(27) =1a(28) =1a(29) =6820
External references
- oeis: A157212