a(n) = 1 - n^10.

Terms

a(0) =1a(1) =0a(2) =-1023a(3) =-59048a(4) =-1048575a(5) =-9765624a(6) =-60466175a(7) =-282475248a(8) =-1073741823a(9) =-3486784400a(10) =-9999999999a(11) =-25937424600a(12) =-61917364223a(13) =-137858491848a(14) =-289254654975a(15) =-576650390624