4 times hexagonal numbers: a(n) = 4*n*(2*n-1).

Terms

a(0) =0a(1) =4a(2) =24a(3) =60a(4) =112a(5) =180a(6) =264a(7) =364a(8) =480a(9) =612a(10) =760a(11) =924a(12) =1104a(13) =1300a(14) =1512a(15) =1740a(16) =1984a(17) =2244a(18) =2520a(19) =2812a(20) =3120a(21) =3444a(22) =3784a(23) =4140a(24) =4512a(25) =4900a(26) =5304a(27) =5724a(28) =6160a(29) =6612