60-gonal (hexacontagonal) numbers: a(n) = n(29n - 28).

Terms

a(0) =0a(1) =1a(2) =60a(3) =177a(4) =352a(5) =585a(6) =876a(7) =1225a(8) =1632a(9) =2097a(10) =2620a(11) =3201a(12) =3840a(13) =4537a(14) =5292a(15) =6105a(16) =6976a(17) =7905a(18) =8892a(19) =9937a(20) =11040a(21) =12201a(22) =13420a(23) =14697a(24) =16032a(25) =17425a(26) =18876a(27) =20385a(28) =21952a(29) =23577