31-gonal numbers: a(n) = n*(29*n-27)/2.

Terms

a(0) =0a(1) =1a(2) =31a(3) =90a(4) =178a(5) =295a(6) =441a(7) =616a(8) =820a(9) =1053a(10) =1315a(11) =1606a(12) =1926a(13) =2275a(14) =2653a(15) =3060a(16) =3496a(17) =3961a(18) =4455a(19) =4978a(20) =5530a(21) =6111a(22) =6721a(23) =7360a(24) =8028a(25) =8725a(26) =9451a(27) =10206a(28) =10990a(29) =11803