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 | 12 |
| 2 | 56 |
| 3 | 992 |
| 4 | 16256 |
| 5 | 60480 |
| 6 | 65520 |
| 7 | 4357080 |
| 8 | 47139840 |
| 9 | 67100672 |
| 10 | 91065600 |
| 11 | 285981696 |
| 12 | 2758909440 |
| 13 | 17179738112 |
| 14 | 87722956800 |
| 15 | 132867440640 |
| 16 | 274877382656 |
| 17 | 306007080960 |
| 18 | 806062473216 |
| 19 | 1409150457792 |
| 20 | 363485766938112 |
| 21 | 12177456042320640 |
| 22 | 29884246553283840 |
| 23 | 40316371715063808 |