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 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 13 |
| 6 | 44 |
| 7 | 144 |
| 8 | 577 |
| 9 | 2457 |
| 10 | 12499 |
| 11 | 72394 |
| 12 | 508942 |
| 13 | 4408389 |
| 14 | 49858593 |
| 15 | 769196039 |
| 16 | 16729819397 |