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 | 7 |
| 4 | 23 |
| 5 | 88 |
| 6 | 339 |
| 7 | 1396 |
| 8 | 5915 |
| 9 | 26080 |
| 10 | 118539 |
| 11 | 555678 |
| 12 | 2678458 |
| 13 | 13262193 |
| 14 | 67353325 |
| 15 | 350493424 |
| 16 | 1866989802 |
| 17 | 10171394388 |
| 18 | 56631507822 |
| 19 | 322011612423 |
| 20 | 1868702977253 |
| 21 | 11061267210030 |
| 22 | 66745602611831 |
| 23 | 410360493588788 |
| 24 | 2569318971123439 |
| 25 | 16374787277199728 |
| 26 | 106180292431149021 |