a(n) = n^5 - n^4 + n^3 - n^2 + n - 1.

Terms

a(0) =-1a(1) =0a(2) =21a(3) =182a(4) =819a(5) =2604a(6) =6665a(7) =14706a(8) =29127a(9) =53144a(10) =90909a(11) =147630a(12) =229691a(13) =344772a(14) =501969a(15) =711914a(16) =986895a(17) =1340976a(18) =1790117a(19) =2352294a(20) =3047619a(21) =3898460a(22) =4929561a(23) =6168162a(24) =7644119a(25) =9390024a(26) =11441325a(27) =13836446a(28) =16616907a(29) =19827444