Triangle where the g.f. of column k is 1/(1-x)^(k^2) for k>=1, as read by rows n>=1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =10a(8) =9a(9) =1a(10) =1a(11) =20a(12) =45a(13) =16a(14) =1a(15) =1a(16) =35a(17) =165a(18) =136a(19) =25a(20) =1a(21) =1a(22) =56a(23) =495a(24) =816a(25) =325a(26) =36a(27) =1a(28) =1a(29) =84