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

Terms

a(0) =1a(1) =512a(2) =19682a(3) =262144a(4) =1953126a(5) =10077184a(6) =40353606a(7) =134217728a(8) =387400807a(9) =1000000512a(10) =2357947690a(11) =5159518208a(12) =10604499374a(13) =20661046272a(14) =38441425932a(15) =68719476736a(16) =118587876498a(17) =198349213184a(18) =322687697778a(19) =512000262144a(20) =794239673292