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 | 1 |
| 2 | 15 |
| 3 | 635 |
| 4 | 53112 |
| 5 | 7367444 |
| 6 | 1529130770 |
| 7 | 443685287576 |
| 8 | 171495189203456 |
| 9 | 85174828026304824 |
| 10 | 52856314387144232184 |
| 11 | 40077340463437963801752 |
| 12 | 36457068309928364981668848 |
| 13 | 39186634107857517367884040632 |