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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 11 |
| 8 | 23 |
| 9 | 50 |
| 10 | 110 |
| 11 | 247 |
| 12 | 565 |
| 13 | 1308 |
| 14 | 3067 |
| 15 | 7264 |
| 16 | 17355 |
| 17 | 41790 |
| 18 | 101327 |
| 19 | 247205 |
| 20 | 606456 |
| 21 | 1495255 |
| 22 | 3703422 |
| 23 | 9210589 |
| 24 | 22994029 |
| 25 | 57603919 |
| 26 | 144770421 |
| 27 | 364916488 |
| 28 | 922357821 |
| 29 | 2337297441 |