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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 8 |
| 5 | 24 |
| 6 | 120 |
| 7 | 128 |
| 8 | 384 |
| 9 | 1920 |
| 10 | 3456 |
| 11 | 17280 |
| 12 | 32768 |
| 13 | 98304 |
| 14 | 491520 |
| 15 | 884736 |
| 16 | 4423680 |
| 17 | 30965760 |
| 18 | 71663616 |
| 19 | 358318080 |
| 20 | 2147483648 |
| 21 | 6442450944 |
| 22 | 32212254720 |
| 23 | 57982058496 |
| 24 | 289910292480 |
| 25 | 2029372047360 |
| 26 | 4696546738176 |
| 27 | 23482733690880 |
| 28 | 164379135836160 |
| 29 | 587068342272000 |