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

Terms

a(0) =0a(1) =2a(2) =12a(3) =36a(4) =80a(5) =150a(6) =252a(7) =392a(8) =576a(9) =810a(10) =1100a(11) =1452a(12) =1872a(13) =2366a(14) =2940a(15) =3600a(16) =4352a(17) =5202a(18) =6156a(19) =7220a(20) =8400a(21) =9702a(22) =11132a(23) =12696a(24) =14400a(25) =16250a(26) =18252a(27) =20412a(28) =22736a(29) =25230