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 | 42 |
| 5 | 18 |
| 6 | 1 |
| 7 | 336 |
| 8 | 276 |
| 9 | 36 |
| 10 | 1 |
| 11 | 3024 |
| 12 | 4200 |
| 13 | 960 |
| 14 | 60 |
| 15 | 1 |
| 16 | 30240 |
| 17 | 66024 |
| 18 | 23400 |
| 19 | 2460 |
| 20 | 90 |
| 21 | 1 |
| 22 | 332640 |
| 23 | 1086624 |
| 24 | 557424 |
| 25 | 87360 |
| 26 | 5250 |
| 27 | 126 |
| 28 | 1 |
| 29 | 3991680 |
| 30 | 18805248 |
| 31 | 13349952 |
| 32 | 2916144 |
| 33 | 255360 |
| 34 | 9912 |
| 35 | 168 |
| 36 | 1 |
| 37 | 51891840 |
| 38 | 342486144 |
| 39 | 325854144 |
| 40 | 95001984 |