12-gonal (or dodecagonal) numbers: a(n) = n*(5*n-4).

Terms

a(0) =0a(1) =1a(2) =12a(3) =33a(4) =64a(5) =105a(6) =156a(7) =217a(8) =288a(9) =369a(10) =460a(11) =561a(12) =672a(13) =793a(14) =924a(15) =1065a(16) =1216a(17) =1377a(18) =1548a(19) =1729a(20) =1920a(21) =2121a(22) =2332a(23) =2553a(24) =2784a(25) =3025a(26) =3276a(27) =3537a(28) =3808a(29) =4089