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 | 12 |
| 4 | 114 |
| 5 | 940 |
| 6 | 7568 |
| 7 | 61728 |
| 8 | 512996 |
| 9 | 4334884 |
| 10 | 37164700 |
| 11 | 322624804 |
| 12 | 2830973320 |
| 13 | 25074130996 |
| 14 | 223900666504 |
| 15 | 2013718244072 |