a(0)=3; a(n) = n^2 + a(n-1) for n>0.

Terms

a(0) =3a(1) =4a(2) =8a(3) =17a(4) =33a(5) =58a(6) =94a(7) =143a(8) =207a(9) =288a(10) =388a(11) =509a(12) =653a(13) =822a(14) =1018a(15) =1243a(16) =1499a(17) =1788a(18) =2112a(19) =2473a(20) =2873a(21) =3314a(22) =3798a(23) =4327a(24) =4903a(25) =5528a(26) =6204a(27) =6933a(28) =7717a(29) =8558