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 | 8 |
| 4 | 62 |
| 5 | 924 |
| 6 | 26394 |
| 7 | 1442764 |
| 8 | 150786848 |
| 9 | 30114993376 |
| 10 | 11489639088218 |
| 11 | 8372083277093216 |
| 12 | 11649087077771471438 |
| 13 | 30947648445392475219812 |
| 14 | 156963868041535457457609234 |
| 15 | 1519762800266538697863301357568 |