Triangle T(n, k) = binomial(n*f(n,k), f(n,k)), where f(n, k) = k if k <= floor(n/2) otherwise n-k, read by rows.
A157219
Triangle T(n, k) = binomial(n*f(n,k), f(n,k)), where f(n, k) = k if k <= floor(n/2) otherwise n-k, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =3a(9) =1a(10) =1a(11) =4a(12) =28a(13) =4a(14) =1a(15) =1a(16) =5a(17) =45a(18) =45a(19) =5a(20) =1a(21) =1a(22) =6a(23) =66a(24) =816a(25) =66a(26) =6a(27) =1a(28) =1a(29) =7
External references
- oeis: A157219