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) |
|---|---|
| 3 | 31 |
| 4 | 1261 |
| 5 | 9979201 |
| 6 | 1556755201 |
| 7 | 88921857024001 |
| 8 | 30411275102208001 |
| 9 | 6463004184721244160001 |
| 10 | 2210440498434925488635904000001 |
| 11 | 2055709663544480704431390720000001 |