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 | 456 |
| 3 | 12345 |
| 4 | 90123456 |
| 5 | 678901234567890 |
| 6 | 1234567890123456 |
| 7 | 45678901234567890123456 |
| 8 | 901234567890123456789012345678901234567890123456 |