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 | 0 |
| 2 | 112 |
| 3 | 5040 |
| 4 | 188034 |
| 5 | 6872424 |
| 6 | 255757328 |
| 7 | 9790184488 |
| 8 | 386105784866 |
| 9 | 15669594394610 |
| 10 | 653037680536962 |
| 11 | 27884254995169022 |
| 12 | 1217213333853178756 |