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 | 12 |
| 6 | 20 |
| 7 | 60 |
| 8 | 147 |
| 9 | 384 |
| 10 | 896 |
| 11 | 360 |
| 12 | 1540 |
| 13 | 2760 |
| 14 | 2304 |
| 15 | 11016 |
| 16 | 13860 |
| 17 | 6720 |
| 18 | 123060 |
| 19 | 255024 |
| 20 | 658370 |
| 21 | 1422720 |
| 22 | 1425606 |
| 23 | 1179360 |
| 24 | 2920500 |
| 25 | 12252240 |
| 26 | 9989280 |
| 27 | 24227280 |
| 28 | 242573760 |
| 29 | 68424048 |
| 30 | 990208128 |
| 31 | 410810400 |
| 32 | 602751600 |