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

Terms

a(0) =1a(1) =5a(2) =17a(3) =43a(4) =89a(5) =161a(6) =265a(7) =407a(8) =593a(9) =829a(10) =1121a(11) =1475a(12) =1897a(13) =2393a(14) =2969a(15) =3631a(16) =4385a(17) =5237a(18) =6193a(19) =7259a(20) =8441a(21) =9745a(22) =11177a(23) =12743a(24) =14449a(25) =16301a(26) =18305a(27) =20467a(28) =22793a(29) =25289