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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 41 |
| 5 | 343 |
| 6 | 6327 |
| 7 | 249995 |
| 8 | 20536020 |
| 9 | 3445474030 |
| 10 | 1169394086932 |
| 11 | 798731069436512 |
| 12 | 1094825607339329108 |
| 13 | 3006942191342795594938 |
| 14 | 16533858553282474307626008 |
| 15 | 181924651566316766693192987410 |