a(n) = Sum_{d|n, d==1 mod 4} d^8 - Sum_{d|n, d==3 mod 4} d^8.

Terms

a(0) =1a(1) =1a(2) =-6560a(3) =1a(4) =390626a(5) =-6560a(6) =-5764800a(7) =1a(8) =43040161a(9) =390626a(10) =-214358880a(11) =-6560a(12) =815730722a(13) =-5764800a(14) =-2562506560a(15) =1a(16) =6975757442a(17) =43040161a(18) =-16983563040a(19) =390626a(20) =37817088000a(21) =-214358880a(22) =-78310985280a(23) =-6560a(24) =152588281251a(25) =815730722