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

Terms

a(0) =1a(1) =0a(2) =-1022a(3) =-59043a(4) =-1048552a(5) =-9765505a(6) =-60465456a(7) =-282470209a(8) =-1073701504a(9) =-3486421521a(10) =-9996371200a(11) =-25897507801a(12) =-61438362624a(13) =-131631471049a(14) =-202076363776a(15) =731023977375