Triangular numbers containing 2k digits in which the sum of the first k digits = that of the rest.

Terms

a(0) =55a(1) =66a(2) =2415a(3) =3003a(4) =5050a(5) =5151a(6) =5995a(7) =8778a(8) =9045a(9) =113050a(10) =138075a(11) =171405a(12) =174345a(13) =177906a(14) =183921a(15) =198765a(16) =203203a(17) =216153a(18) =219453a(19) =234270a(20) =237705a(21) =239086a(22) =252405a(23) =255255a(24) =266815a(25) =267546a(26) =275653a(27) =279378a(28) =284635a(29) =293761