Square array A(n,k), n >= 1, k >= 0, read by antidiagonals: A(n,k) = Sum_{d|n} sigma_k(d).

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =4a(5) =3a(6) =1a(7) =6a(8) =5a(9) =6a(10) =1a(11) =10a(12) =11a(13) =11a(14) =3a(15) =1a(16) =18a(17) =29a(18) =27a(19) =7a(20) =9a(21) =1a(22) =34a(23) =83a(24) =83a(25) =27a(26) =20a(27) =3a(28) =1a(29) =66