Triangle read by rows: T(n, k) = binomial(2*k, k) * binomial(2*n, n) / (n + 1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =12a(6) =5a(7) =10a(8) =30a(9) =100a(10) =14a(11) =28a(12) =84a(13) =280a(14) =980a(15) =42a(16) =84a(17) =252a(18) =840a(19) =2940a(20) =10584a(21) =132a(22) =264a(23) =792a(24) =2640a(25) =9240a(26) =33264a(27) =121968a(28) =429a(29) =858