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 | 3 |
| 3 | 14 |
| 4 | 83 |
| 5 | 574 |
| 6 | 4432 |
| 7 | 37244 |
| 8 | 335153 |
| 9 | 3194510 |
| 10 | 32001596 |
| 11 | 335019839 |
| 12 | 3649450270 |
| 13 | 41227610316 |
| 14 | 481724831132 |
| 15 | 5809341783543 |
| 16 | 72177761136925 |
| 17 | 922539273876404 |
| 18 | 12115001489115910 |
| 19 | 163284755614174305 |