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) |
|---|---|
| 3 | 1 |
| 4 | 8 |
| 5 | 47 |
| 6 | 253 |
| 7 | 1345 |
| 8 | 7304 |
| 9 | 41193 |
| 10 | 243152 |
| 11 | 1506521 |
| 12 | 9799547 |
| 13 | 66844755 |
| 14 | 477297022 |
| 15 | 3560469469 |
| 16 | 27692022408 |
| 17 | 224128400923 |
| 18 | 1884299045789 |
| 19 | 16427961558365 |
| 20 | 148293477761232 |
| 21 | 1384008870213057 |
| 22 | 13336887952918752 |
| 23 | 132535336519342301 |
| 24 | 1356662080571809755 |