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 | 47 |
| 2 | 11396 |
| 3 | 2217871 |
| 4 | 447264801 |
| 5 | 89761235312 |
| 6 | 18027314711921 |
| 7 | 3620162014192047 |
| 8 | 726995373373259268 |
| 9 | 145993770068726584623 |
| 10 | 29318189070923580394385 |
| 11 | 5887622256467996898381824 |
| 12 | 1182340968901089528485742513 |
| 13 | 237435437338572028041097654463 |