Second 14-gonal numbers: n*(6*n+5).

Terms

a(0) =0a(1) =11a(2) =34a(3) =69a(4) =116a(5) =175a(6) =246a(7) =329a(8) =424a(9) =531a(10) =650a(11) =781a(12) =924a(13) =1079a(14) =1246a(15) =1425a(16) =1616a(17) =1819a(18) =2034a(19) =2261a(20) =2500a(21) =2751a(22) =3014a(23) =3289a(24) =3576a(25) =3875a(26) =4186a(27) =4509a(28) =4844a(29) =5191