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 | 48 |
| 2 | 12240 |
| 3 | 3108960 |
| 4 | 789663648 |
| 5 | 200571457680 |
| 6 | 50944360587120 |
| 7 | 12939667017670848 |
| 8 | 3286624478127808320 |
| 9 | 834789677777445642480 |
| 10 | 212033291530993065381648 |
| 11 | 53855621259194461161296160 |
| 12 | 13679115766543862141903843040 |
| 13 | 3474441549080881789582414836048 |