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 | 6 |
| 2 | 24 |
| 3 | 100 |
| 4 | 418 |
| 5 | 1748 |
| 6 | 7310 |
| 7 | 30570 |
| 8 | 127842 |
| 9 | 534628 |
| 10 | 2235784 |
| 11 | 9349922 |
| 12 | 39100844 |
| 13 | 163517514 |
| 14 | 683820978 |
| 15 | 2859700582 |
| 16 | 11959105792 |
| 17 | 50012302772 |
| 18 | 209148616298 |
| 19 | 874647662172 |
| 20 | 3657726962214 |
| 21 | 15296406894730 |
| 22 | 63968706878962 |