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 | 6 |
| 3 | 22 |
| 4 | 84 |
| 5 | 346 |
| 6 | 1476 |
| 7 | 6322 |
| 8 | 26844 |
| 9 | 112666 |
| 10 | 467796 |
| 11 | 1925122 |
| 12 | 7867404 |
| 13 | 31980586 |
| 14 | 129475716 |
| 15 | 522603922 |
| 16 | 2104600764 |
| 17 | 8461122106 |
| 18 | 33972973236 |
| 19 | 136278002722 |
| 20 | 546271650924 |
| 21 | 2188568145226 |
| 22 | 8764722448356 |
| 23 | 35090249881522 |
| 24 | 140455100761884 |
| 25 | 562102748697946 |
| 26 | 2249258115629076 |