Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + n^(n-1) * binomial(n-2, k-1) otherwise.
A146990
Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + n^(n-1) * binomial(n-2, k-1) otherwise.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =12a(8) =12a(9) =1a(10) =1a(11) =68a(12) =134a(13) =68a(14) =1a(15) =1a(16) =630a(17) =1885a(18) =1885a(19) =630a(20) =1a(21) =1a(22) =7782a(23) =31119a(24) =46676a(25) =31119a(26) =7782a(27) =1a(28) =1a(29) =117656
External references
- oeis: A146990