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 | 6 |
| 4 | 22 |
| 5 | 102 |
| 6 | 562 |
| 7 | 3618 |
| 8 | 26586 |
| 9 | 219798 |
| 10 | 2018686 |
| 11 | 20393790 |
| 12 | 224750298 |
| 13 | 2683250082 |
| 14 | 34498833434 |
| 15 | 475237879950 |
| 16 | 6983085189454 |
| 17 | 109021986683046 |
| 18 | 1802213242949602 |
| 19 | 31447143854808378 |
| 20 | 577609702827987882 |
| 21 | 11139837273501641502 |
| 22 | 225075546284489412854 |