Triangle read by rows. T(n, k) = binomial(n, k)^2 * CatalanNumber(k).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =2a(6) =1a(7) =9a(8) =18a(9) =5a(10) =1a(11) =16a(12) =72a(13) =80a(14) =14a(15) =1a(16) =25a(17) =200a(18) =500a(19) =350a(20) =42a(21) =1a(22) =36a(23) =450a(24) =2000a(25) =3150a(26) =1512a(27) =132a(28) =1a(29) =49