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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 448 |
| 7 | 3136 |
| 8 | 25088 |
| 9 | 238080 |
| 10 | 2780160 |
| 11 | 32409600 |
| 12 | 439263232 |
| 13 | 5793579008 |
| 14 | 84589174784 |
| 15 | 1277254508544 |
| 16 | 20436072136704 |
| 17 | 347559326515200 |
| 18 | 6269816107433984 |
| 19 | 119673237950431232 |
| 20 | 2402480754490605568 |
| 21 | 50578266728651816960 |
| 22 | 1116823836321860550656 |