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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 24 |
| 6 | 96 |
| 7 | 384 |
| 8 | 1536 |
| 9 | 7680 |
| 10 | 46080 |
| 11 | 276480 |
| 12 | 1658880 |
| 13 | 11612160 |
| 14 | 92897280 |
| 15 | 743178240 |
| 16 | 5945425920 |
| 17 | 53508833280 |
| 18 | 535088332800 |
| 19 | 5350883328000 |
| 20 | 53508833280000 |
| 21 | 588597166080000 |
| 22 | 7063165992960000 |