12 times hexagonal numbers: 12*n*(2*n-1).

Terms

a(0) =0a(1) =12a(2) =72a(3) =180a(4) =336a(5) =540a(6) =792a(7) =1092a(8) =1440a(9) =1836a(10) =2280a(11) =2772a(12) =3312a(13) =3900a(14) =4536a(15) =5220a(16) =5952a(17) =6732a(18) =7560a(19) =8436a(20) =9360a(21) =10332a(22) =11352a(23) =12420a(24) =13536a(25) =14700a(26) =15912a(27) =17172a(28) =18480a(29) =19836