Triangle read by rows: T(n, k) = binomial(2*k + n - 1, k - 2)*(n^2 - 2*k + n)/(k*(k - 1)) for k >= 2, T(n, 0) = 1 and T(n, 1) = n - 1.
A387700
Triangle read by rows: T(n, k) = binomial(2*k + n - 1, k - 2)*(n^2 - 2*k + n)/(k*(k - 1)) for k >= 2, T(n, 0) = 1 and T(n, 1) = n - 1.
Terms
- a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =4a(9) =8a(10) =1a(11) =3a(12) =8a(13) =21a(14) =55a(15) =1a(16) =4a(17) =13a(18) =40a(19) =121a(20) =364a(21) =1a(22) =5a(23) =19a(24) =66a(25) =221a(26) =728a(27) =2380a(28) =1a(29) =6
External references
- oeis: A387700