Triangle read by rows: T(n,k) = C(n+k,n)*C(n,k)/(k+1), for n >= 0, k = 0..n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =2a(6) =1a(7) =6a(8) =10a(9) =5a(10) =1a(11) =10a(12) =30a(13) =35a(14) =14a(15) =1a(16) =15a(17) =70a(18) =140a(19) =126a(20) =42a(21) =1a(22) =21a(23) =140a(24) =420a(25) =630a(26) =462a(27) =132a(28) =1a(29) =28