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 | 32 |
| 4 | 321 |
| 5 | 2560 |
| 6 | 18881 |
| 7 | 135072 |
| 8 | 954241 |
| 9 | 6705920 |
| 10 | 47020161 |
| 11 | 329377312 |
| 12 | 2306349761 |
| 13 | 16146574080 |
| 14 | 113032395841 |
| 15 | 791245902752 |
| 16 | 5538778714881 |
| 17 | 38771623191040 |
| 18 | 271401878897921 |
| 19 | 1899814701967392 |
| 20 | 13298707562817601 |
| 21 | 93090966886860800 |
| 22 | 651636810049438401 |