12 times pentagonal numbers: a(n) = 6*n*(3*n-1).

Terms

a(0) =0a(1) =12a(2) =60a(3) =144a(4) =264a(5) =420a(6) =612a(7) =840a(8) =1104a(9) =1404a(10) =1740a(11) =2112a(12) =2520a(13) =2964a(14) =3444a(15) =3960a(16) =4512a(17) =5100a(18) =5724a(19) =6384a(20) =7080a(21) =7812a(22) =8580a(23) =9384a(24) =10224a(25) =11100a(26) =12012a(27) =12960a(28) =13944a(29) =14964