T(n,k) = binomial(n,k)*binomial(n+k,k), 0 <= k <= n, triangle read by rows.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =6a(6) =1a(7) =12a(8) =30a(9) =20a(10) =1a(11) =20a(12) =90a(13) =140a(14) =70a(15) =1a(16) =30a(17) =210a(18) =560a(19) =630a(20) =252a(21) =1a(22) =42a(23) =420a(24) =1680a(25) =3150a(26) =2772a(27) =924a(28) =1a(29) =56