a(n) = 2^n - n^10.

Terms

a(0) =1a(1) =1a(2) =-1020a(3) =-59041a(4) =-1048560a(5) =-9765593a(6) =-60466112a(7) =-282475121a(8) =-1073741568a(9) =-3486783889a(10) =-9999998976a(11) =-25937422553a(12) =-61917360128a(13) =-137858483657a(14) =-289254638592a(15) =-576650357857