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 | 4 |
| 2 | 4 |
| 3 | 17 |
| 4 | 17 |
| 5 | 64 |
| 6 | 64 |
| 7 | 375 |
| 8 | 375 |
| 9 | 2319 |
| 10 | 2319 |
| 11 | 15130 |
| 12 | 15130 |
| 13 | 99554 |
| 14 | 99554 |
| 15 | 675166 |
| 16 | 675166 |
| 17 | 4753617 |
| 18 | 4753617 |
| 19 | 33752394 |
| 20 | 33752394 |
| 21 | 239605153 |
| 22 | 239605153 |