Numbers which are both lucky and triangular.

Terms

a(0) =1a(1) =3a(2) =15a(3) =21a(4) =105a(5) =171a(6) =231a(7) =741a(8) =903a(9) =1275a(10) =1485a(11) =1711a(12) =2211a(13) =2415a(14) =3003a(15) =3403a(16) =3655a(17) =4095a(18) =4465a(19) =4851a(20) =5151a(21) =5253a(22) =5671a(23) =7503a(24) =8001a(25) =8515a(26) =10153a(27) =10585a(28) =10731a(29) =11781