Triangle T(n, k) = T(n-1, k-1) + 3*T(n-1, k) + 2*T(n-1, k-1), with T(n,1) = T(n, n) = 1, read by rows.
A142596
Triangle T(n, k) = T(n-1, k-1) + 3*T(n-1, k) + 2*T(n-1, k-1), with T(n,1) = T(n, n) = 1, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =1a(6) =1a(7) =21a(8) =21a(9) =1a(10) =1a(11) =66a(12) =126a(13) =66a(14) =1a(15) =1a(16) =201a(17) =576a(18) =576a(19) =201a(20) =1a(21) =1a(22) =606a(23) =2331a(24) =3456a(25) =2331a(26) =606a(27) =1a(28) =1a(29) =1821
External references
- oeis: A142596