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) |
|---|---|
| 4 | 4 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 80 |
| 9 | 40 |
| 10 | 368 |
| 11 | 352 |
| 12 | 5296 |
| 13 | 3744 |
| 14 | 48656 |
| 15 | 40208 |
| 16 | 523808 |
| 17 | 415488 |
| 18 | 5270976 |
| 19 | 4333504 |
| 20 | 54215264 |
| 21 | 44497728 |
| 22 | 551297184 |
| 23 | 458337984 |
| 24 | 5613555008 |
| 25 | 4691821600 |
| 26 | 56981627840 |
| 27 | 47988689152 |
| 28 | 577641089664 |
| 29 | 489273948160 |
| 30 | 5845628996352 |