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 | 44 |
| 3 | 2320 |
| 4 | 54800 |
| 5 | 1146112 |
| 6 | 23278472 |
| 7 | 468028264 |
| 8 | 9376805048 |
| 9 | 187644496672 |
| 10 | 3753613318520 |
| 11 | 75077089399408 |
| 12 | 1501573939443704 |
| 13 | 30031693123408792 |
| 14 | 600635291349699440 |
| 15 | 12012715352891236816 |
| 16 | 240254370564131706488 |
| 17 | 4805087834658423387496 |
| 18 | 96101759515675744360544 |