Triangle T(n,k) read by rows: the coefficient [x^n] of x^2/(1-(k+1)*x-x^3) in row n, columns 0 <= k <= n.
A117716
Triangle T(n,k) read by rows: the coefficient [x^n] of x^2/(1-(k+1)*x-x^3) in row n, columns 0 <= k <= n.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =3a(9) =4a(10) =1a(11) =4a(12) =9a(13) =16a(14) =25a(15) =2a(16) =9a(17) =28a(18) =65a(19) =126a(20) =217a(21) =3a(22) =20a(23) =87a(24) =264a(25) =635a(26) =1308a(27) =2415a(28) =4a(29) =44
External references
- oeis: A117716