Second accumulation array of A185877, by antidiagonals.

Terms

a(0) =1a(1) =5a(2) =3a(3) =16a(4) =17a(5) =6a(6) =40a(7) =56a(8) =38a(9) =10a(10) =85a(11) =140a(12) =128a(13) =70a(14) =15a(15) =161a(16) =295a(17) =320a(18) =240a(19) =115a(20) =21a(21) =280a(22) =553a(23) =670a(24) =600a(25) =400a(26) =175a(27) =28a(28) =456a(29) =952