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 | 24 |
| 5 | 48 |
| 6 | 182 |
| 7 | 868 |
| 8 | 5752 |
| 9 | 37156 |
| 10 | 296944 |
| 11 | 2738820 |
| 12 | 28894206 |
| 13 | 335399468 |
| 14 | 4285522402 |
| 15 | 59536763892 |
| 16 | 892785282788 |