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 | 0 |
| 3 | 1 |
| 4 | 225 |
| 5 | 87192 |
| 6 | 57435240 |
| 7 | 60478511040 |
| 8 | 96212546526096 |
| 9 | 220716443548094400 |
| 10 | 702901008498298112640 |
| 11 | 3011788599493603375929600 |
| 12 | 16916605752011965307094124800 |
| 13 | 121848941490162387021464335349760 |
| 14 | 1104617766019213143798099163667712000 |