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 | 3 |
| 4 | 14 |
| 5 | 55 |
| 6 | 195 |
| 7 | 644 |
| 8 | 2016 |
| 9 | 6048 |
| 10 | 17520 |
| 11 | 49280 |
| 12 | 135168 |
| 13 | 362752 |
| 14 | 955136 |
| 15 | 2472960 |
| 16 | 6307840 |
| 17 | 15876096 |
| 18 | 39481344 |
| 19 | 97124352 |
| 20 | 236584960 |
| 21 | 571146240 |
| 22 | 1367539712 |
| 23 | 3249799168 |
| 24 | 7669284864 |
| 25 | 17983078400 |
| 26 | 41916825600 |
| 27 | 97165246464 |
| 28 | 224076496896 |
| 29 | 514272002048 |
| 30 | 1174992322560 |