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 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 40 |
| 5 | 256 |
| 6 | 12232 |
| 7 | 526773 |
| 8 | 8684025 |
| 9 | 768561384 |
| 10 | 28938090375 |
| 11 | 1273675677456 |
| 12 | 73821863714933 |
| 13 | 7601760995500947 |
| 14 | 527066887623562528 |