a(n) = n*(5*n+1).

Terms

a(0) =0a(1) =6a(2) =22a(3) =48a(4) =84a(5) =130a(6) =186a(7) =252a(8) =328a(9) =414a(10) =510a(11) =616a(12) =732a(13) =858a(14) =994a(15) =1140a(16) =1296a(17) =1462a(18) =1638a(19) =1824a(20) =2020a(21) =2226a(22) =2442a(23) =2668a(24) =2904a(25) =3150a(26) =3406a(27) =3672a(28) =3948a(29) =4234