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

Terms

a(0) =1a(1) =9a(2) =-924a(3) =-58049a(4) =-1038576a(5) =-9665625a(6) =-59466176a(7) =-272475249a(8) =-973741824a(9) =-2486784401a(10) =0a(11) =74062575399a(12) =938082635776