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 | 2 |
| 3 | 4 |
| 4 | 7 |
| 5 | 24 |
| 6 | 46 |
| 7 | 138 |
| 8 | 507 |
| 9 | 1466 |
| 10 | 3641 |
| 11 | 4806 |
| 12 | 106716 |
| 13 | 301330 |
| 14 | 1173587 |
| 15 | 1771791 |
| 16 | 7868294 |
| 17 | 156060995 |
| 18 | 8126341146 |
| 19 | 64642714833 |
| 20 | 292435587912 |
| 21 | 586597464339 |
| 22 | 1138023523395 |
| 23 | 2232671126262 |
| 24 | 21006004690614 |
| 25 | 28738943640898 |
| 26 | 570863391802477 |
| 27 | 88656067576349103 |