a(n) = Sum_{d|n, d==1 (mod 4)} d^9 - Sum_{d|n, d==3 (mod 4)} d^9.

Terms

a(0) =1a(1) =1a(2) =-19682a(3) =1a(4) =1953126a(5) =-19682a(6) =-40353606a(7) =1a(8) =387400807a(9) =1953126a(10) =-2357947690a(11) =-19682a(12) =10604499374a(13) =-40353606a(14) =-38441425932a(15) =1a(16) =118587876498a(17) =387400807a(18) =-322687697778a(19) =1953126a(20) =794239673292a(21) =-2357947690a(23) =-19682