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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 8 |
| 5 | 24 |
| 6 | 92 |
| 7 | 432 |
| 8 | 2740 |
| 9 | 23822 |
| 10 | 264185 |
| 11 | 3545166 |
| 12 | 59474514 |
| 13 | 1343942004 |
| 14 | 41179884383 |
| 15 | 1593533376361 |
| 16 | 74665098131246 |
| 17 | 4404743069577837 |
| 18 | 351138858279113987 |
| 19 | 37740395752334771775 |
| 20 | 5093113605218543006445 |