a(n) = 2*n*(4*n - 1).

Terms

a(0) =0a(1) =6a(2) =28a(3) =66a(4) =120a(5) =190a(6) =276a(7) =378a(8) =496a(9) =630a(10) =780a(11) =946a(12) =1128a(13) =1326a(14) =1540a(15) =1770a(16) =2016a(17) =2278a(18) =2556a(19) =2850a(20) =3160a(21) =3486a(22) =3828a(23) =4186a(24) =4560a(25) =4950a(26) =5356a(27) =5778a(28) =6216a(29) =6670