a(n) = n^8 + n^7 - n^5 - n^4 - n^3 + n + 1.

Terms

a(0) =1a(1) =1a(2) =331a(3) =8401a(4) =80581a(5) =464881a(6) =1950271a(7) =6568801a(8) =18837001a(9) =47763361a(10) =109889011a(11) =233669041a(12) =465542221a(13) =878077201a(14) =1580623591a(15) =2732936641a(16) =4562284561a(17) =7384587841a(18) =11630180251a(19) =17874821521a(20) =26876632021a(21) =39619660081a(22) =57364832911a(23) =81709082401a(24) =114653477401a(25) =158681234401