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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 12 |
| 6 | 72 |
| 7 | 54 |
| 8 | 432 |
| 9 | 3888 |
| 10 | 3888 |
| 11 | 42768 |
| 12 | 47916 |
| 13 | 62298 |
| 14 | 872172 |
| 15 | 13968 |
| 16 | 221688 |
| 17 | 57996 |
| 18 | 143928 |
| 19 | 134712 |
| 20 | 269154 |
| 21 | 563994 |
| 22 | 1247868 |
| 23 | 286344 |
| 24 | 877356 |
| 25 | 171864 |
| 26 | 513324 |
| 27 | 1252728 |
| 28 | 3414474 |
| 29 | 914616 |
| 30 | 41868 |
| 31 | 119178 |
| 32 | 454716 |
| 33 | 127188 |
| 34 | 527832 |
| 35 | 15642 |
| 36 | 91332 |
| 37 | 192924 |
| 38 | 125892 |
| 39 | 29718 |