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

Terms

a(0) =1a(1) =11a(2) =99a(3) =427a(4) =1253a(5) =2931a(6) =5911a(7) =10739a(8) =18057a(9) =28603a(10) =43211a(11) =62811a(12) =88429a(13) =121187a(14) =162303a(15) =213091a(16) =274961a(17) =349419a(18) =438067a(19) =542603a(20) =664821a(21) =806611a(22) =969959a(23) =1156947a(24) =1369753a(25) =1610651a(26) =1882011a(27) =2186299a(28) =2526077a(29) =2904003