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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 49 |
| 5 | 241 |
| 6 | 721 |
| 7 | 16801 |
| 8 | 204961 |
| 9 | 1276129 |
| 10 | 19968481 |
| 11 | 417479041 |
| 12 | 4522597201 |
| 13 | 62399971921 |
| 14 | 1685741065009 |
| 15 | 28122880050721 |
| 16 | 415551065616961 |
| 17 | 12085752936331201 |
| 18 | 281057646411506881 |
| 19 | 4923299166925874689 |
| 20 | 143004800073025326961 |
| 21 | 4244797186148550210481 |