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 | 3 |
| 2 | 15 |
| 3 | 1236378 |
| 4 | 1454365 |
| 5 | 3541791 |
| 6 | 104856921 |
| 7 | 2677839153 |
| 8 | 3656187921870 |
| 9 | 3973810409128 |
| 10 | 1448587865213374600 |
| 11 | 36691639282445615088081 |