Triangle T(n,k) = binomial(n, k)*(3*binomial(n, k)^2 - binomial(n, k) - 1), read by rows.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =18a(5) =1a(6) =1a(7) =69a(8) =69a(9) =1a(10) =1a(11) =172a(12) =606a(13) =172a(14) =1a(15) =1a(16) =345a(17) =2890a(18) =2890a(19) =345a(20) =1a(21) =1a(22) =606a(23) =9885a(24) =23580a(25) =9885a(26) =606a(27) =1a(28) =1a(29) =973