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

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =1a(7) =4a(8) =0a(9) =0a(10) =1a(11) =9a(12) =1a(13) =0a(14) =0a(15) =1a(16) =16a(17) =126a(18) =0a(19) =0a(20) =0a(21) =1a(22) =25a(23) =1820a(24) =1a(25) =0a(26) =0a(27) =0a(28) =1a(29) =36