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 | 5 |
| 4 | 16 |
| 5 | 53 |
| 6 | 194 |
| 7 | 730 |
| 8 | 2868 |
| 9 | 11526 |
| 10 | 47370 |
| 11 | 197786 |
| 12 | 837467 |
| 13 | 3585696 |
| 14 | 15501423 |
| 15 | 67563442 |
| 16 | 296579626 |
| 17 | 1309973823 |
| 18 | 5817855174 |
| 19 | 25964218471 |
| 20 | 116379947718 |
| 21 | 523699384013 |
| 22 | 2364967753113 |
| 23 | 10714396241046 |
| 24 | 48684193997623 |