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 | 2 |
| 2 | 4 |
| 3 | 15 |
| 4 | 39 |
| 5 | 87 |
| 6 | 183 |
| 7 | 951 |
| 8 | 1255 |
| 9 | 1527 |
| 10 | 3063 |
| 11 | 15335 |
| 12 | 12279 |
| 13 | 61431 |
| 14 | 49143 |
| 15 | 516047 |
| 16 | 491495 |
| 17 | 1703767 |
| 18 | 1310695 |
| 19 | 8257487 |
| 20 | 3145719 |
| 21 | 15728631 |
| 22 | 12582903 |
| 23 | 94371815 |
| 24 | 50331639 |
| 25 | 352321527 |
| 26 | 335544295 |