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) |
|---|---|
| 4 | 1 |
| 5 | 14 |
| 6 | 125 |
| 7 | 911 |
| 8 | 5920 |
| 9 | 35785 |
| 10 | 205991 |
| 11 | 1145389 |
| 12 | 6208974 |
| 13 | 33019048 |
| 14 | 173020608 |
| 15 | 896198760 |
| 16 | 4599517316 |
| 17 | 23431544274 |
| 18 | 118650995097 |
| 19 | 597852859509 |
| 20 | 3000150410123 |
| 21 | 15004346987002 |
| 22 | 74827169741248 |
| 23 | 372278740384010 |
| 24 | 1848449139166668 |