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 | 4 |
| 3 | 24 |
| 4 | 152 |
| 5 | 1080 |
| 6 | 8152 |
| 7 | 63976 |
| 8 | 518232 |
| 9 | 4299728 |
| 10 | 36360872 |
| 11 | 312284536 |
| 12 | 2716694880 |
| 13 | 23891215320 |
| 14 | 212064567160 |
| 15 | 1897551819416 |