Triangular numbers that are palindromes in base 9.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =10a(5) =91a(6) =136a(7) =300a(8) =528a(9) =820a(10) =4560a(11) =7381a(12) =11476a(13) =20910a(14) =42486a(15) =66430a(16) =552826a(17) =581581a(18) =597871a(19) =1664400a(20) =2001000a(21) =3420420a(22) =3444000a(23) =5070520a(24) =5380840a(25) =48427561a(26) =75995956a(27) =132494781a(28) =134553810a(29) =137158203