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 | 7 |
| 3 | 29 |
| 4 | 163 |
| 5 | 925 |
| 6 | 5580 |
| 7 | 34751 |
| 8 | 222627 |
| 9 | 1456952 |
| 10 | 9699872 |
| 11 | 65474460 |
| 12 | 446971110 |
| 13 | 3080074508 |
| 14 | 21393773841 |
| 15 | 149614083615 |
| 16 | 1052537452164 |
| 17 | 7443584137525 |
| 18 | 52888757972865 |
| 19 | 377382278671610 |
| 20 | 2703141489113003 |
| 21 | 19430405608302831 |
| 22 | 140118758417377105 |