Square array A(n,k), n >= 1, k >= 0, read by antidiagonals: A(n,k) = Sum_{d|n} (-1)^(n/d+1)*d^k.

Terms

a(0) =1a(1) =1a(2) =0a(3) =1a(4) =1a(5) =2a(6) =1a(7) =3a(8) =4a(9) =-1a(10) =1a(11) =7a(12) =10a(13) =1a(14) =2a(15) =1a(16) =15a(17) =28a(18) =11a(19) =6a(20) =0a(21) =1a(22) =31a(23) =82a(24) =55a(25) =26a(26) =4a(27) =2a(28) =1a(29) =63