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

Terms

a(0) =0a(1) =12a(2) =60a(3) =168a(4) =360a(5) =660a(6) =1092a(7) =1680a(8) =2448a(9) =3420a(10) =4620a(11) =6072a(12) =7800a(13) =9828a(14) =12180a(15) =14880a(16) =17952a(17) =21420a(18) =25308a(19) =29640a(20) =34440a(21) =39732a(22) =45540a(23) =51888a(24) =58800a(25) =66300a(26) =74412a(27) =83160a(28) =92568a(29) =102660