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 | 1 |
| 2 | 1 |
| 3 | 32 |
| 4 | 2448 |
| 5 | 477595 |
| 6 | 172497380 |
| 7 | 95614528147 |
| 8 | 83140881147429 |
| 9 | 108654322319421237 |
| 10 | 182417905018755002030 |
| 11 | 368053025250427620488738 |
| 12 | 1203788517781390541953924706 |
| 13 | 3772396790098755787608470015082 |