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 | 2 |
| 2 | 4 |
| 3 | 3 |
| 4 | 16 |
| 5 | 25 |
| 6 | 192 |
| 7 | 427 |
| 8 | 4352 |
| 9 | 12465 |
| 10 | 158720 |
| 11 | 555731 |
| 12 | 8491008 |
| 13 | 817115 |
| 14 | 626311168 |
| 15 | 2990414715 |
| 16 | 60920233984 |
| 17 | 329655706465 |
| 18 | 7555152347136 |
| 19 | 45692713833379 |
| 20 | 232711080902656 |
| 21 | 7777794952988025 |
| 22 | 217865914337460224 |