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 | 3 |
| 1 | 4 |
| 2 | 20 |
| 3 | 20 |
| 4 | 140 |
| 5 | 28 |
| 6 | 140 |
| 7 | 20 |
| 8 | 220 |
| 9 | 44 |
| 10 | 20020 |
| 11 | 1820 |
| 12 | 1820 |
| 13 | 4 |
| 14 | 340 |
| 15 | 340 |
| 16 | 45220 |
| 17 | 532 |
| 18 | 29260 |
| 19 | 220 |
| 20 | 5060 |
| 21 | 92 |
| 22 | 41860 |
| 23 | 1820 |
| 24 | 1820 |
| 25 | 4 |
| 26 | 580 |
| 27 | 580 |
| 28 | 1384460 |
| 29 | 9548 |
| 30 | 811580 |
| 31 | 340 |
| 32 | 340 |
| 33 | 4 |
| 34 | 1279460 |
| 35 | 1279460 |
| 36 | 1279460 |
| 37 | 4 |
| 38 | 9020 |
| 39 | 9020 |
| 40 | 2715020 |
| 41 | 1204 |
| 42 | 138460 |
| 43 | 460 |