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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 9 |
| 6 | 18 |
| 7 | 40 |
| 8 | 98 |
| 9 | 262 |
| 10 | 757 |
| 11 | 2344 |
| 12 | 7723 |
| 13 | 26918 |
| 14 | 98790 |
| 15 | 380361 |
| 16 | 1531699 |
| 17 | 6434386 |
| 18 | 28130891 |
| 19 | 127729731 |
| 20 | 601196429 |
| 21 | 2928369918 |
| 22 | 14738842362 |
| 23 | 76547694742 |
| 24 | 409718539682 |
| 25 | 2257459567237 |
| 26 | 12789959138944 |
| 27 | 74439150889081 |
| 28 | 444647798089246 |
| 29 | 2723583835351856 |