33-gonal numbers: n(31n-29)/2.

Terms

a(0) =0a(1) =1a(2) =33a(3) =96a(4) =190a(5) =315a(6) =471a(7) =658a(8) =876a(9) =1125a(10) =1405a(11) =1716a(12) =2058a(13) =2431a(14) =2835a(15) =3270a(16) =3736a(17) =4233a(18) =4761a(19) =5320a(20) =5910a(21) =6531a(22) =7183a(23) =7866a(24) =8580a(25) =9325a(26) =10101a(27) =10908a(28) =11746a(29) =12615