Triangle read by rows: T(n,k) is the number of 2-compositions of n having length k (0 <= k <= n).

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =3a(5) =4a(6) =0a(7) =4a(8) =12a(9) =8a(10) =0a(11) =5a(12) =25a(13) =36a(14) =16a(15) =0a(16) =6a(17) =44a(18) =102a(19) =96a(20) =32a(21) =0a(22) =7a(23) =70a(24) =231a(25) =344a(26) =240a(27) =64a(28) =0a(29) =8