Triangle read by rows: T(n, k) = binomial(n - 1, k - 1)*binomial(n + k, k).

Terms

a(0) =1a(1) =0a(2) =2a(3) =0a(4) =3a(5) =6a(6) =0a(7) =4a(8) =20a(9) =20a(10) =0a(11) =5a(12) =45a(13) =105a(14) =70a(15) =0a(16) =6a(17) =84a(18) =336a(19) =504a(20) =252a(21) =0a(22) =7a(23) =140a(24) =840a(25) =2100a(26) =2310a(27) =924a(28) =0a(29) =8