Second accumulation array, T, of the natural number array A000027, by antidiagonals.

Terms

a(0) =1a(1) =4a(2) =5a(3) =11a(4) =19a(5) =15a(6) =25a(7) =49a(8) =55a(9) =35a(10) =50a(11) =105a(12) =136a(13) =125a(14) =70a(15) =91a(16) =200a(17) =280a(18) =300a(19) =245a(20) =126a(21) =154a(22) =350a(23) =515a(24) =600a(25) =575a(26) =434a(27) =210a(28) =246a(29) =574