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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 1 |
| 6 | 30 |
| 7 | 132 |
| 8 | 27 |
| 9 | 1 |
| 10 | 336 |
| 11 | 2232 |
| 12 | 696 |
| 13 | 52 |
| 14 | 1 |
| 15 | 5040 |
| 16 | 46320 |
| 17 | 19500 |
| 18 | 2200 |
| 19 | 85 |
| 20 | 1 |
| 21 | 95040 |
| 22 | 1141920 |
| 23 | 606960 |
| 24 | 91800 |
| 25 | 5340 |
| 26 | 126 |
| 27 | 1 |
| 28 | 2162160 |
| 29 | 32639040 |
| 30 | 20991600 |
| 31 | 3986640 |
| 32 | 310170 |
| 33 | 11004 |
| 34 | 175 |
| 35 | 1 |
| 36 | 57657600 |
| 37 | 1061746560 |
| 38 | 802287360 |
| 39 | 183550080 |