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 | 5 |
| 4 | 10 |
| 5 | 22 |
| 6 | 51 |
| 7 | 111 |
| 8 | 256 |
| 9 | 594 |
| 10 | 1324 |
| 11 | 3130 |
| 12 | 7285 |
| 13 | 16435 |
| 14 | 39430 |
| 15 | 91959 |
| 16 | 211519 |
| 17 | 506408 |
| 18 | 1182650 |
| 19 | 2760810 |
| 20 | 6592080 |
| 21 | 15409740 |
| 22 | 36369225 |
| 23 | 86666790 |
| 24 | 202738635 |
| 25 | 482548825 |
| 26 | 1148125550 |
| 27 | 2687285975 |
| 28 | 6439167735 |
| 29 | 15301850850 |
| 30 | 35843163720 |