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 | 2 |
| 3 | 18 |
| 4 | 6912 |
| 5 | 216000000 |
| 6 | 1632586752000000000 |
| 7 | 498266101635303733401600000000000 |
| 8 | 1140494258799407218656986754465090350453096448000000000000000 |