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 | 2 |
| 2 | 4 |
| 3 | 52 |
| 4 | 40 |
| 5 | 688 |
| 6 | 4900 |
| 7 | 63112 |
| 8 | 178240 |
| 9 | 38272 |
| 10 | 5357056 |
| 11 | 1997824 |
| 12 | 247221760 |
| 13 | 586504192 |
| 14 | 707436544 |
| 15 | 15582115840 |
| 16 | 47145459712 |
| 17 | 77620412416 |
| 18 | 1871289057280 |
| 19 | 17787921498112 |
| 20 | 10891875057664 |
| 21 | 146305150615552 |
| 22 | 535618317844480 |
| 23 | 15921951753109504 |
| 24 | 39754688251297792 |