T(n, k) = 3*T(n-1, k-1) + T(n-1, k) for k < n and T(n, n) = 1, T(n, k) = 0, if k < 0 or k > n; triangle read by rows.
A119673
T(n, k) = 3*T(n-1, k-1) + T(n-1, k) for k < n and T(n, n) = 1, T(n, k) = 0, if k < 0 or k > n; triangle read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =7a(8) =13a(9) =1a(10) =1a(11) =10a(12) =34a(13) =40a(14) =1a(15) =1a(16) =13a(17) =64a(18) =142a(19) =121a(20) =1a(21) =1a(22) =16a(23) =103a(24) =334a(25) =547a(26) =364a(27) =1a(28) =1a(29) =19
External references
- oeis: A119673