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) |
|---|---|
| 2 | 1 |
| 3 | 34 |
| 4 | 561 |
| 5 | 5087 |
| 6 | 30569 |
| 7 | 138103 |
| 8 | 507360 |
| 9 | 1594272 |
| 10 | 4433484 |
| 11 | 11176033 |
| 12 | 25989535 |
| 13 | 56493801 |
| 14 | 115960208 |
| 15 | 226569266 |
| 16 | 424098592 |
| 17 | 764503872 |
| 18 | 1332959307 |
| 19 | 2256042444 |
| 20 | 3717882133 |
| 21 | 5981238571 |
| 22 | 9414651939 |
| 23 | 14526981953 |
| 24 | 22010865680 |
| 25 | 32796846160 |