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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 20 |
| 5 | 44 |
| 6 | 97 |
| 7 | 212 |
| 8 | 455 |
| 9 | 961 |
| 10 | 2014 |
| 11 | 4219 |
| 12 | 8863 |
| 13 | 18662 |
| 14 | 39298 |
| 15 | 82584 |
| 16 | 173008 |
| 17 | 361321 |
| 18 | 752823 |
| 19 | 1566271 |
| 20 | 3256418 |
| 21 | 6768409 |
| 22 | 14064705 |
| 23 | 29213846 |
| 24 | 60634364 |
| 25 | 125706899 |
| 26 | 260227836 |
| 27 | 537737396 |
| 28 | 1108954613 |