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 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 64 |
| 6 | 1088 |
| 7 | 33792 |
| 8 | 4194304 |
| 9 | 536870912 |
| 10 | 137975824384 |
| 11 | 70506183131136 |
| 12 | 72127962782105600 |
| 13 | 147646010183714340864 |