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) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 60 |
| 4 | 440 |
| 5 | 3230 |
| 6 | 23688 |
| 7 | 173796 |
| 8 | 1275240 |
| 9 | 9359748 |
| 10 | 68708320 |
| 11 | 504466468 |
| 12 | 3704376384 |
| 13 | 27205146592 |