a(n) = Sum_{d|n} (-1)^(d-1)*d^8.

Terms

a(0) =1a(1) =-255a(2) =6562a(3) =-65791a(4) =390626a(5) =-1673310a(6) =5764802a(7) =-16843007a(8) =43053283a(9) =-99609630a(10) =214358882a(11) =-431720542a(12) =815730722a(13) =-1470024510a(14) =2563287812a(15) =-4311810303a(16) =6975757442a(17) =-10978587165a(18) =16983563042a(19) =-25699675166a(20) =37828630724a(21) =-54661514910a(22) =78310985282a(23) =-110523811934a(24) =152588281251a(25) =-208011334110