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 | 1 |
| 3 | 1 |
| 4 | 5 |
| 5 | 21 |
| 6 | 61 |
| 7 | 211 |
| 8 | 1401 |
| 9 | 8065 |
| 10 | 37241 |
| 11 | 240021 |
| 12 | 1997821 |
| 13 | 13856701 |
| 14 | 94418325 |
| 15 | 874328911 |
| 16 | 8304303281 |
| 17 | 69158458881 |
| 18 | 658339599601 |
| 19 | 7454839614985 |
| 20 | 78224066633781 |
| 21 | 805961931388741 |
| 22 | 9828080719704941 |
| 23 | 124199805022959051 |
| 24 | 1466207770078872745 |