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 | 4 |
| 3 | 33 |
| 4 | 416 |
| 5 | 7045 |
| 6 | 149472 |
| 7 | 3804353 |
| 8 | 112784896 |
| 9 | 3812791581 |
| 10 | 144643185600 |
| 11 | 6081135558817 |
| 12 | 280510445260800 |
| 13 | 14080668974435141 |
| 14 | 763890295406672896 |
| 15 | 44529851124925034625 |
| 16 | 2775373003913373810688 |
| 17 | 184147301185264051623181 |