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 | 14 |
| 2 | 120 |
| 3 | 264 |
| 4 | 0 |
| 5 | 3752 |
| 6 | 34632 |
| 7 | 80812 |
| 8 | 0 |
| 9 | 1201220 |
| 10 | 11395632 |
| 11 | 27164010 |
| 12 | 0 |
| 13 | 412081530 |
| 14 | 3962205256 |
| 15 | 9551670652 |
| 16 | 0 |
| 17 | 146582674200 |
| 18 | 1420696529280 |
| 19 | 3448764292020 |
| 20 | 0 |
| 21 | 53320604716082 |
| 22 | 519526871115120 |
| 23 | 1267129662479106 |
| 24 | 0 |
| 25 | 19692671314474548 |