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 | 49 |
| 3 | 340 |
| 4 | 4235 |
| 5 | 39706 |
| 6 | 397068 |
| 7 | 3970918 |
| 8 | 39523168 |
| 9 | 395436300 |
| 10 | 3953296865 |