a(n) = n^4 - 3*n^3 + 6*n^2 - 5*n + 2 (n >= 1).

Terms

a(0) =1a(1) =8a(2) =41a(3) =142a(4) =377a(5) =836a(6) =1633a(7) =2906a(8) =4817a(9) =7552a(10) =11321a(11) =16358a(12) =22921a(13) =31292a(14) =41777a(15) =54706a(16) =70433a(17) =89336a(18) =111817a(19) =138302a(20) =169241a(21) =205108a(22) =246401a(23) =293642a(24) =347377a(25) =408176a(26) =476633a(27) =553366a(28) =639017a(29) =734252