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 | 3 |
| 4 | 22 |
| 5 | 93 |
| 6 | 790 |
| 7 | 7202 |
| 8 | 53884 |
| 9 | 640932 |
| 10 | 7175700 |
| 11 | 150597632 |
| 12 | 3323171712 |
| 13 | 92150022336 |
| 14 | 2899990063360 |
| 15 | 72285872321536 |