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 | 2 |
| 4 | 6 |
| 5 | 6 |
| 6 | 30 |
| 7 | 4 |
| 8 | 72 |
| 9 | 72 |
| 10 | 210 |
| 11 | 132 |
| 12 | 132 |
| 13 | 114 |
| 14 | 594 |
| 15 | 48 |
| 16 | 354 |
| 17 | 1860 |
| 18 | 3942 |
| 19 | 2574 |
| 20 | 2574 |
| 21 | 2574 |
| 22 | 20910 |
| 23 | 20910 |
| 24 | 9600 |
| 25 | 9600 |