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) |
|---|---|
| 3 | 2 |
| 4 | 5 |
| 5 | 20 |
| 6 | 8 |
| 7 | 56 |
| 8 | 56 |
| 9 | 74 |
| 10 | 180 |
| 11 | 660 |
| 12 | 220 |
| 13 | 2288 |
| 14 | 2002 |
| 15 | 2942 |
| 16 | 7280 |
| 17 | 24752 |
| 18 | 8568 |
| 19 | 93024 |
| 20 | 77520 |
| 21 | 120920 |
| 22 | 298452 |
| 23 | 1009470 |
| 24 | 346104 |
| 25 | 3845600 |
| 26 | 3289000 |
| 27 | 5067974 |
| 28 | 12432420 |
| 29 | 42921450 |
| 30 | 14307150 |
| 31 | 161280600 |
| 32 | 140244000 |
| 33 | 215188426 |
| 34 | 524512560 |
| 35 | 1835793960 |