Triangle read by rows: T(n,k) = binomial(n^2, k), 0 <= k <= n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =6a(6) =1a(7) =9a(8) =36a(9) =84a(10) =1a(11) =16a(12) =120a(13) =560a(14) =1820a(15) =1a(16) =25a(17) =300a(18) =2300a(19) =12650a(20) =53130a(21) =1a(22) =36a(23) =630a(24) =7140a(25) =58905a(26) =376992a(27) =1947792a(28) =1a(29) =49