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 | 0 |
| 2 | 6 |
| 3 | 9 |
| 4 | 39 |
| 5 | 56 |
| 6 | 230 |
| 7 | 329 |
| 8 | 1343 |
| 9 | 1920 |
| 10 | 7830 |
| 11 | 11193 |
| 12 | 45639 |
| 13 | 65240 |
| 14 | 266006 |
| 15 | 380249 |
| 16 | 1550399 |
| 17 | 2216256 |
| 18 | 9036390 |
| 19 | 12917289 |
| 20 | 52667943 |
| 21 | 75287480 |
| 22 | 306971270 |
| 23 | 438807593 |
| 24 | 1789159679 |
| 25 | 2557558080 |
| 26 | 10427986806 |
| 27 | 14906540889 |
| 28 | 60778761159 |
| 29 | 86881687256 |