A138568 Erroneous duplicate of A136094.
1, 212, 3212321, 4321234321234, 543212345432123454321, 6543212345654321234565432123456, 7654321234567654321234567654321234567654321
Offset: 1
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.