Here is the next numbers in the sequence:
1, 121, 12321, 1234321, 123454321, 12345654321, 123456764321, 123456787654321, 12345678987654321, etc.
Answer:
1, 121, 12321, 1234321, 123454321, 12345654321, 123456764321, 123456787654321, 12345678987654321,
