Numbers of the form 9*m^2 + 4*m, m an integer.

Terms

a(0) =0a(1) =5a(2) =13a(3) =28a(4) =44a(5) =69a(6) =93a(7) =128a(8) =160a(9) =205a(10) =245a(11) =300a(12) =348a(13) =413a(14) =469a(15) =544a(16) =608a(17) =693a(18) =765a(19) =860a(20) =940a(21) =1045a(22) =1133a(23) =1248a(24) =1344a(25) =1469a(26) =1573a(27) =1708a(28) =1820a(29) =1965