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 | 1 |
| 2 | 2 |
| 3 | 240 |
| 4 | 4 |
| 5 | 80 |
| 6 | 240 |
| 7 | 1361360 |
| 8 | 8 |
| 9 | 12252240 |
| 10 | 80 |
| 11 | 194480 |
| 12 | 240 |
| 13 | 1040 |
| 14 | 1361360 |
| 15 | 4095840 |
| 16 | 16 |
| 17 | 17680 |
| 18 | 12252240 |
| 19 | 107158480 |
| 20 | 80 |
| 21 | 1344 |
| 22 | 194480 |
| 23 | 1365280 |
| 24 | 240 |
| 25 | 535792400 |
| 26 | 1040 |
| 27 | 44841486948146266934850832405421294927083491752830032389039800908293040266400 |