Triangular numbers representable as x*y+x+y such that x and y are triangular numbers, x>=y>0.

Terms

a(0) =3a(1) =15a(2) =21a(3) =91a(4) =120a(5) =153a(6) =351a(7) =406a(8) =703a(9) =741a(10) =1891a(11) =3081a(12) =3403a(13) =4465a(14) =5151a(15) =5565a(16) =6555a(17) =9453a(18) =9591a(19) =18721a(20) =22791a(21) =23871a(22) =38226a(23) =39903a(24) =46056a(25) =52326a(26) =79401a(27) =85491a(28) =91378a(29) =104653