a(n) = 1 + 2*n^2 + 3*n^3 + 4*n^4 +5*n^5 + 6*n^6 + 7*n^7.

Terms

a(0) =1a(1) =28a(2) =1537a(3) =21322a(4) =145633a(5) =659176a(6) =2284273a(7) =6565462a(8) =16434817a(9) =36993268a(10) =76543201a(11) =147907618a(12) =270071137a(13) =470178112a(14) =785923153a(15) =1268369326a(16) =1985229313a(17) =3024644812a(18) =4499499457a(19) =6552300538a(20) =9360664801a(21) =13143443608a(22) =18167522737