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) |
|---|---|
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 1 |
| 6 | 13 |
| 7 | 18 |
| 8 | 1 |
| 9 | 50 |
| 10 | 205 |
| 11 | 180 |
| 12 | 1 |
| 13 | 201 |
| 14 | 1865 |
| 15 | 4245 |
| 16 | 2700 |
| 17 | 1 |
| 18 | 875 |
| 19 | 16674 |
| 20 | 74165 |
| 21 | 114345 |
| 22 | 56700 |
| 23 | 1 |
| 24 | 4138 |
| 25 | 155477 |
| 26 | 1208830 |
| 27 | 3394790 |
| 28 | 3919860 |
| 29 | 1587600 |
| 30 | 1 |
| 31 | 21145 |
| 32 | 1542699 |
| 33 | 19800165 |
| 34 | 90265560 |
| 35 | 182184030 |
| 36 | 167310360 |
| 37 | 57153600 |
| 38 | 1 |
| 39 | 115973 |
| 40 | 16385857 |
| 41 | 335976195 |
| 42 | 2338275240 |
| 43 | 7342024200 |
| 44 | 11471572350 |
| 45 | 8719666200 |
| 46 | 2571912000 |