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 | 82 |
| 5 | 306 |
| 6 | 1142 |
| 7 | 4262 |
| 8 | 15906 |
| 9 | 59362 |
| 10 | 221542 |
| 11 | 826806 |
| 12 | 3085682 |
| 13 | 11515922 |
| 14 | 42978006 |
| 15 | 160396102 |
| 16 | 598606402 |
| 17 | 2234029506 |
| 18 | 8337511622 |
| 19 | 31116016982 |
| 20 | 116126556306 |
| 21 | 433390208242 |
| 22 | 1617434276662 |
| 23 | 6036346898406 |
| 24 | 22527953316962 |
| 25 | 84075466369442 |
| 26 | 313773912160806 |