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 | 1 |
| 4 | 6 |
| 5 | 5 |
| 6 | 1 |
| 7 | 24 |
| 8 | 23 |
| 9 | 9 |
| 10 | 1 |
| 11 | 120 |
| 12 | 119 |
| 13 | 68 |
| 14 | 14 |
| 15 | 1 |
| 16 | 720 |
| 17 | 719 |
| 18 | 517 |
| 19 | 152 |
| 20 | 20 |
| 21 | 1 |
| 22 | 5040 |
| 23 | 5039 |
| 24 | 4163 |
| 25 | 1581 |
| 26 | 292 |
| 27 | 27 |
| 28 | 1 |
| 29 | 40320 |
| 30 | 40319 |
| 31 | 36180 |
| 32 | 16776 |
| 33 | 3917 |
| 34 | 508 |
| 35 | 35 |
| 36 | 1 |
| 37 | 362880 |
| 38 | 362879 |
| 39 | 341733 |
| 40 | 186030 |
| 41 | 52029 |
| 42 | 8489 |
| 43 | 823 |
| 44 | 44 |
| 45 | 1 |