a(n) = 1 - n^8.

Terms

a(0) =1a(1) =0a(2) =-255a(3) =-6560a(4) =-65535a(5) =-390624a(6) =-1679615a(7) =-5764800a(8) =-16777215a(9) =-43046720a(10) =-99999999a(11) =-214358880a(12) =-429981695a(13) =-815730720a(14) =-1475789055a(15) =-2562890624a(16) =-4294967295a(17) =-6975757440a(18) =-11019960575a(19) =-16983563040a(20) =-25599999999a(21) =-37822859360a(22) =-54875873535