Accumulation array of A185912, by antidiagonals.

Terms

a(0) =1a(1) =4a(2) =6a(3) =10a(4) =21a(5) =20a(6) =20a(7) =48a(8) =66a(9) =50a(10) =35a(11) =90a(12) =144a(13) =160a(14) =105a(15) =56a(16) =150a(17) =260a(18) =340a(19) =330a(20) =196a(21) =84a(22) =231a(23) =420a(24) =600a(25) =690a(26) =609a(27) =336a(28) =120a(29) =336