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 | 12 |
| 2 | 168 |
| 3 | 2184 |
| 4 | 28548 |
| 5 | 371112 |
| 6 | 4826640 |
| 7 | 62746152 |
| 8 | 815728368 |
| 9 | 10604468628 |
| 10 | 137858461104 |
| 11 | 1792159992168 |
| 12 | 23298084722808 |
| 13 | 302875101365928 |
| 14 | 3937376380474992 |
| 15 | 51185892946146672 |
| 16 | 665416609115237772 |
| 17 | 8650415918497693704 |
| 18 | 112455406951074120024 |