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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 16 |
| 7 | 16 |
| 8 | 16 |
| 9 | 1296 |
| 10 | 20736 |
| 11 | 20736 |
| 12 | 20736 |
| 13 | 20736 |
| 14 | 20736 |
| 15 | 20736 |
| 16 | 331776 |
| 17 | 331776 |
| 18 | 429981696 |
| 19 | 429981696 |
| 20 | 268738560000 |
| 21 | 268738560000 |
| 22 | 268738560000 |
| 23 | 268738560000 |
| 24 | 4299816960000 |
| 25 | 4299816960000 |
| 26 | 4299816960000 |
| 27 | 348285173760000 |
| 28 | 13379723235164160000 |