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 | 12 |
| 5 | 36 |
| 6 | 174 |
| 7 | 708 |
| 8 | 4334 |
| 9 | 31424 |
| 10 | 263732 |
| 11 | 2503296 |
| 12 | 26844578 |
| 13 | 316692056 |
| 14 | 4090634212 |
| 15 | 57274447458 |
| 16 | 863488976620 |