Triangle read by rows, T(n,m) = sigma_{n-m}(m) for n >= 1, m = 1,2, ..., n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =3a(5) =2a(6) =1a(7) =5a(8) =4a(9) =3a(10) =1a(11) =9a(12) =10a(13) =7a(14) =2a(15) =1a(16) =17a(17) =28a(18) =21a(19) =6a(20) =4a(21) =1a(22) =33a(23) =82a(24) =73a(25) =26a(26) =12a(27) =2a(28) =1a(29) =65