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 | 5 |
| 2 | 29 |
| 3 | 193 |
| 4 | 1441 |
| 5 | 11765 |
| 6 | 102701 |
| 7 | 941857 |
| 8 | 8955937 |
| 9 | 87439877 |
| 10 | 870218525 |
| 11 | 8780788513 |
| 12 | 89476873345 |
| 13 | 918150779957 |
| 14 | 9467752541933 |
| 15 | 97965021468865 |
| 16 | 1016097175530433 |
| 17 | 10556565963815045 |
| 18 | 109802406545873309 |
| 19 | 1143006276663287809 |
| 20 | 11904902286515536609 |