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 | 1 |
| 1 | 0 |
| 2 | 4 |
| 3 | 0 |
| 4 | 48 |
| 5 | 32 |
| 6 | 640 |
| 7 | 896 |
| 8 | 8960 |
| 9 | 18432 |
| 10 | 130048 |
| 11 | 337920 |
| 12 | 1941504 |
| 13 | 5857280 |
| 14 | 29605888 |
| 15 | 98435072 |
| 16 | 458424320 |
| 17 | 1624375296 |
| 18 | 7174881280 |
| 19 | 26507476992 |
| 20 | 113123524608 |
| 21 | 429538672640 |
| 22 | 1792440008704 |
| 23 | 6929367695360 |
| 24 | 28495396732928 |