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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 51 |
| 7 | 1106 |
| 8 | 3813 |
| 9 | 47300 |
| 10 | 216420 |
| 11 | 2057581 |
| 12 | 10276981 |
| 13 | 74358924 |