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 | 2 |
| 2 | 10 |
| 3 | 75 |
| 4 | 780 |
| 5 | 10556 |
| 6 | 178031 |
| 7 | 3630780 |
| 8 | 87548580 |
| 9 | 2452523325 |
| 10 | 78697155750 |
| 11 | 2859220516290 |
| 12 | 116482516809889 |
| 13 | 5277304280371714 |
| 14 | 264005848594606490 |
| 15 | 14493602135008296115 |
| 16 | 868435614538568029188 |
| 17 | 56520205738693680322836 |