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 | 0 |
| 2 | 24 |
| 3 | 1 |
| 4 | 43 |
| 5 | 19 |
| 6 | 762 |
| 7 | 640 |
| 8 | 3732 |
| 9 | 6577 |
| 10 | 16061 |
| 11 | 247146 |
| 12 | 273840 |
| 13 | 879326 |
| 14 | 5380812 |
| 15 | 10593200 |
| 16 | 171880711 |
| 17 | 105176740 |
| 18 | 517694394 |
| 19 | 559015193 |
| 20 | 824827924 |