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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 11 |
| 8 | 25 |
| 9 | 58 |
| 10 | 135 |
| 11 | 317 |
| 12 | 750 |
| 13 | 1785 |
| 14 | 4272 |
| 15 | 10275 |
| 16 | 24823 |
| 17 | 60210 |
| 18 | 146576 |
| 19 | 358010 |
| 20 | 877087 |
| 21 | 2154751 |
| 22 | 5307166 |
| 23 | 13102511 |
| 24 | 32418806 |
| 25 | 80375267 |
| 26 | 199650310 |
| 27 | 496803811 |
| 28 | 1238276667 |
| 29 | 3091173482 |
| 30 | 7727893389 |
| 31 | 19346109435 |
| 32 | 48493869237 |