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 | 2 |
| 4 | 6 |
| 5 | 2 |
| 6 | 6 |
| 7 | 24 |
| 8 | 12 |
| 9 | 12 |
| 10 | 24 |
| 11 | 120 |
| 12 | 216 |
| 13 | 12 |
| 14 | 216 |
| 15 | 120 |
| 16 | 720 |
| 17 | 5280 |
| 18 | 576 |
| 19 | 576 |
| 20 | 5280 |
| 21 | 720 |
| 22 | 5040 |
| 23 | 190800 |
| 24 | 66240 |
| 25 | 576 |
| 26 | 66240 |
| 27 | 190800 |
| 28 | 5040 |
| 29 | 40320 |
| 30 | 9344160 |
| 31 | 15321600 |
| 32 | 161280 |
| 33 | 161280 |
| 34 | 15321600 |
| 35 | 9344160 |
| 36 | 40320 |
| 37 | 362880 |
| 38 | 598066560 |
| 39 | 5411750400 |
| 40 | 283046400 |