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 | 5 |
| 3 | 1 |
| 4 | 30 |
| 5 | 15 |
| 6 | 1 |
| 7 | 210 |
| 8 | 195 |
| 9 | 30 |
| 10 | 1 |
| 11 | 1680 |
| 12 | 2550 |
| 13 | 675 |
| 14 | 50 |
| 15 | 1 |
| 16 | 15120 |
| 17 | 34830 |
| 18 | 14025 |
| 19 | 1725 |
| 20 | 75 |
| 21 | 1 |
| 22 | 151200 |
| 23 | 502740 |
| 24 | 287280 |
| 25 | 51975 |
| 26 | 3675 |
| 27 | 105 |
| 28 | 1 |
| 29 | 1663200 |
| 30 | 7692300 |
| 31 | 5961060 |
| 32 | 1482705 |
| 33 | 151200 |
| 34 | 6930 |
| 35 | 140 |
| 36 | 1 |
| 37 | 19958400 |
| 38 | 124740000 |
| 39 | 126913500 |
| 40 | 41545980 |