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

Terms

a(0) =1a(1) =256a(2) =6560a(3) =65536a(4) =390626a(5) =1679360a(6) =5764800a(7) =16777216a(8) =43040161a(9) =100000256a(10) =214358880a(11) =429916160a(12) =815730722a(13) =1475788800a(14) =2562506560a(15) =4294967296a(16) =6975757442a(17) =11018281216a(18) =16983563040a(19) =25600065536a(20) =37817088000a(21) =54875873280a(22) =78310985280a(23) =110058536960a(24) =152588281251a(25) =208827064832