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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 123 |
| 3 | 12345 |
| 4 | 1234567 |
| 5 | 123456789 |
| 6 | 12345679011 |
| 7 | 1234567901233 |
| 8 | 123456790123455 |
| 9 | 12345679012345677 |
| 10 | 1234567901234567899 |
| 11 | 123456790123456790121 |
| 12 | 12345679012345679012343 |