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 | 2 |
| 2 | 5 |
| 3 | 64 |
| 4 | 1107 |
| 5 | 160160 |
| 6 | 5713367 |
| 7 | 889747443 |
| 8 | 62837596341 |
| 9 | 11671262491586 |
| 10 | 3090090680653053 |
| 11 | 635672008069583520 |
| 12 | 278356729040728193703 |