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 | 5 |
| 3 | 42 |
| 4 | 462 |
| 5 | 6070 |
| 6 | 90686 |
| 7 | 1493962 |
| 8 | 26584610 |
| 9 | 503663959 |