Triangle read by rows: T(n,0) = T(n,n) = 0 and T(n,k) = T(n, k-1) + T(n-1, k-1) + T(n-2, k-1) + k for 0 < k < n.
A391467
Triangle read by rows: T(n,0) = T(n,n) = 0 and T(n,k) = T(n, k-1) + T(n-1, k-1) + T(n-2, k-1) + k for 0 < k < n.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =0a(6) =0a(7) =1a(8) =4a(9) =0a(10) =0a(11) =1a(12) =5a(13) =12a(14) =0a(15) =0a(16) =1a(17) =5a(18) =17a(19) =33a(20) =0a(21) =0a(22) =1a(23) =5a(24) =18a(25) =51a(26) =89a(27) =0a(28) =0a(29) =1
External references
- oeis: A391467