Triangle read by rows: t(n,m) = binomial(2*n,2*m) * binomial(n,m).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =12a(5) =1a(6) =1a(7) =45a(8) =45a(9) =1a(10) =1a(11) =112a(12) =420a(13) =112a(14) =1a(15) =1a(16) =225a(17) =2100a(18) =2100a(19) =225a(20) =1a(21) =1a(22) =396a(23) =7425a(24) =18480a(25) =7425a(26) =396a(27) =1a(28) =1a(29) =637