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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 44 |
| 3 | 1024 |
| 4 | 34568 |
| 5 | 1535440 |
| 6 | 84871680 |
| 7 | 5613017128 |
| 8 | 432539436508 |
| 9 | 38053315307904 |
| 10 | 3763518275715424 |