Triangular numbers whose digit reversal is also a triangular number.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =55a(6) =66a(7) =120a(8) =153a(9) =171a(10) =190a(11) =300a(12) =351a(13) =595a(14) =630a(15) =666a(16) =820a(17) =3003a(18) =5995a(19) =8778a(20) =15051a(21) =17578a(22) =66066a(23) =87571a(24) =156520a(25) =180300a(26) =185745a(27) =547581a(28) =557040a(29) =617716