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 | 7 |
| 1 | 1 |
| 2 | 4 |
| 3 | 20 |
| 4 | 276 |
| 5 | 320 |
| 6 | 1088 |
| 7 | 65856 |
| 8 | 66112 |
| 9 | 66624 |
| 10 | 263232 |