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 | 2 |
| 3 | 53 |
| 4 | 258 |
| 5 | 25746 |
| 6 | 53746 |
| 7 | 161946 |
| 8 | 7930238 |
| 9 | 14927378 |
| 10 | 29810546 |
| 11 | 4714751561 |
| 12 | 25742623453 |
| 13 | 94268917816334704578 |