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 | 2 |
| 2 | 10 |
| 3 | 6 |
| 4 | 12 |
| 5 | 9888 |
| 6 | 90 |
| 7 | 672 |
| 8 | 37680 |
| 9 | 3422877696 |
| 10 | 159840 |
| 11 | 35640 |
| 12 | 2977920 |
| 13 | 61724520 |
| 14 | 9530611200 |
| 15 | 272065167360 |
| 16 | 613958400 |