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 | 3 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 25 |
| 6 | 53 |
| 7 | 116 |
| 8 | 249 |
| 9 | 535 |
| 10 | 1155 |
| 11 | 2487 |
| 12 | 5358 |
| 13 | 11545 |
| 14 | 24871 |
| 15 | 53584 |
| 16 | 115444 |
| 17 | 248715 |
| 18 | 535841 |
| 19 | 1154435 |
| 20 | 2487154 |
| 21 | 5358411 |
| 22 | 11544347 |
| 23 | 24871542 |
| 24 | 53584111 |
| 25 | 115443470 |
| 26 | 248715414 |
| 27 | 535841116 |
| 28 | 1154434691 |
| 29 | 2487154143 |
| 30 | 5358411166 |