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 | 3 |
| 4 | 19 |
| 5 | 207 |
| 6 | 3571 |
| 7 | 93243 |
| 8 | 3603139 |
| 9 | 203658087 |
| 10 | 16725737971 |
| 11 | 1985745828483 |
| 12 | 339119822487139 |
| 13 | 82867477502576847 |
| 14 | 28816562818537878931 |
| 15 | 14182270437347915240523 |
| 16 | 9825699599254424454332419 |