a(n) = n^5 + 4*n^4 + 13*n^3 + 23*n^2 + 25*n + 3.

Terms

a(0) =3a(1) =69a(2) =345a(3) =1203a(4) =3351a(5) =7953a(6) =16749a(7) =32175a(8) =57483a(9) =96861a(10) =155553a(11) =239979a(12) =357855a(13) =518313a(14) =732021a(15) =1011303a(16) =1370259a(17) =1824885a(18) =2393193a(19) =3095331a(20) =3953703a(21) =4993089a(22) =6240765a(23) =7726623a(24) =9483291a(25) =11546253a(26) =13953969a(27) =16747995a(28) =19973103a(29) =23677401