Triangle T(n,m) = C(2*n,m)*C(2*n-1,n), 0 <= m <= 2*n, n >= 0.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =12a(6) =18a(7) =12a(8) =3a(9) =10a(10) =60a(11) =150a(12) =200a(13) =150a(14) =60a(15) =10a(16) =35a(17) =280a(18) =980a(19) =1960a(20) =2450a(21) =1960a(22) =980a(23) =280a(24) =35a(25) =126a(26) =1260a(27) =5670a(28) =15120a(29) =26460