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) |
|---|---|
| 5 | 2 |
| 6 | 14 |
| 7 | 72 |
| 8 | 330 |
| 9 | 1430 |
| 10 | 6006 |
| 11 | 24752 |
| 12 | 100776 |
| 13 | 406980 |
| 14 | 1634380 |
| 15 | 6537520 |
| 16 | 26075790 |
| 17 | 103791870 |
| 18 | 412506150 |
| 19 | 1637618400 |
| 20 | 6495886320 |
| 21 | 25751549340 |
| 22 | 102042235620 |
| 23 | 404225281200 |
| 24 | 1600944863700 |
| 25 | 6339741660252 |
| 26 | 25103519174844 |
| 27 | 99399793096352 |