Irregular triangle, read by rows, T(n, k) = binomial(2*n, k)*binomial(2*k, k).

Terms

a(0) =1a(1) =1a(2) =4a(3) =6a(4) =1a(5) =8a(6) =36a(7) =80a(8) =70a(9) =1a(10) =12a(11) =90a(12) =400a(13) =1050a(14) =1512a(15) =924a(16) =1a(17) =16a(18) =168a(19) =1120a(20) =4900a(21) =14112a(22) =25872a(23) =27456a(24) =12870a(25) =1a(26) =20a(27) =270a(28) =2400a(29) =14700