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) |
|---|---|
| 4 | 1 |
| 5 | 12 |
| 6 | 97 |
| 7 | 675 |
| 8 | 4418 |
| 9 | 28396 |
| 10 | 183615 |
| 11 | 1211936 |
| 12 | 8237223 |
| 13 | 57944187 |
| 14 | 422950882 |
| 15 | 3206531728 |
| 16 | 25247250641 |
| 17 | 206313943476 |
| 18 | 1747990803645 |
| 19 | 15336960025775 |
| 20 | 139187730958406 |
| 21 | 1304967471569208 |
| 22 | 12624893940830455 |
| 23 | 125892638744630088 |
| 24 | 1292581981392588771 |