Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = 3^(n-k) * T(n-1,k-1) + 4^k * T(n-1,k) with T(n,k) = n^k if n*k=0.
A383755
Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = 3^(n-k) * T(n-1,k-1) + 4^k * T(n-1,k) with T(n,k) = n^k if n*k=0.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =1a(6) =1a(7) =37a(8) =37a(9) =1a(10) =1a(11) =175a(12) =925a(13) =175a(14) =1a(15) =1a(16) =781a(17) =19525a(18) =19525a(19) =781a(20) =1a(21) =1a(22) =3367a(23) =375661a(24) =1776775a(25) =375661a(26) =3367a(27) =1a(28) =1a(29) =14197
External references
- oeis: A383755