a(n) = n^3 + n.

Terms

a(0) =0a(1) =2a(2) =10a(3) =30a(4) =68a(5) =130a(6) =222a(7) =350a(8) =520a(9) =738a(10) =1010a(11) =1342a(12) =1740a(13) =2210a(14) =2758a(15) =3390a(16) =4112a(17) =4930a(18) =5850a(19) =6878a(20) =8020a(21) =9282a(22) =10670a(23) =12190a(24) =13848a(25) =15650a(26) =17602a(27) =19710a(28) =21980a(29) =24418