a(0)=4; a(n)=n^2+a(n-1) for n>0.

Terms

a(0) =4a(1) =5a(2) =9a(3) =18a(4) =34a(5) =59a(6) =95a(7) =144a(8) =208a(9) =289a(10) =389a(11) =510a(12) =654a(13) =823a(14) =1019a(15) =1244a(16) =1500a(17) =1789a(18) =2113a(19) =2474a(20) =2874a(21) =3315a(22) =3799a(23) =4328a(24) =4904a(25) =5529a(26) =6205a(27) =6934a(28) =7718a(29) =8559