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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 13 |
| 8 | 8037796 |
| 9 | 945095823831333 |
| 10 | 187549729101764460261505 |
| 11 | 66398444413512642732641312352088 |
| 12 | 43100445012087185112567117500931916869587 |