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 | 6 |
| 3 | 1 |
| 4 | 54 |
| 5 | 18 |
| 6 | 1 |
| 7 | 648 |
| 8 | 324 |
| 9 | 36 |
| 10 | 1 |
| 11 | 9720 |
| 12 | 6480 |
| 13 | 1080 |
| 14 | 60 |
| 15 | 1 |
| 16 | 174960 |
| 17 | 145800 |
| 18 | 32400 |
| 19 | 2700 |
| 20 | 90 |
| 21 | 1 |
| 22 | 3674160 |
| 23 | 3674160 |
| 24 | 1020600 |
| 25 | 113400 |
| 26 | 5670 |
| 27 | 126 |
| 28 | 1 |
| 29 | 88179840 |
| 30 | 102876480 |
| 31 | 34292160 |
| 32 | 4762800 |
| 33 | 317520 |
| 34 | 10584 |
| 35 | 168 |
| 36 | 1 |
| 37 | 2380855680 |
| 38 | 3174474240 |
| 39 | 1234517760 |
| 40 | 205752960 |
| 41 | 17146080 |
| 42 | 762048 |
| 43 | 18144 |
| 44 | 216 |
| 45 | 1 |