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

Terms

a(0) =1a(1) =1a(2) =-2a(3) =1a(4) =-3a(5) =2a(6) =1a(7) =-5a(8) =4a(9) =-1a(10) =1a(11) =-9a(12) =10a(13) =-3a(14) =2a(15) =1a(16) =-17a(17) =28a(18) =-13a(19) =6a(20) =-4a(21) =1a(22) =-33a(23) =82a(24) =-57a(25) =26a(26) =-12a(27) =2a(28) =1a(29) =-65