Square array A(n,k), n >= 1, k >= 0, read by antidiagonals, where A(n,k) is Sum_{d|n} d^(k*d).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =5a(5) =2a(6) =1a(7) =17a(8) =28a(9) =3a(10) =1a(11) =65a(12) =730a(13) =261a(14) =2a(15) =1a(16) =257a(17) =19684a(18) =65553a(19) =3126a(20) =4a(21) =1a(22) =1025a(23) =531442a(24) =16777281a(25) =9765626a(26) =46688a(27) =2a(28) =1a(29) =4097