Triangle T(n,k) by rows: T(n, k) = (n-k+1)*T(n-1, k-1) + k*T(n-1, k) + T(n-2, k-1) with T(n, 1) = T(n, n) = 1.
A144438
Triangle T(n,k) by rows: T(n, k) = (n-k+1)*T(n-1, k-1) + k*T(n-1, k) + T(n-2, k-1) with T(n, 1) = T(n, n) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =14a(8) =14a(9) =1a(10) =1a(11) =33a(12) =89a(13) =33a(14) =1a(15) =1a(16) =72a(17) =413a(18) =413a(19) =72a(20) =1a(21) =1a(22) =151a(23) =1632a(24) =3393a(25) =1632a(26) =151a(27) =1a(28) =1a(29) =310
External references
- oeis: A144438