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 | 0 |
| 2 | 0 |
| 3 | 2664 |
| 4 | 101142 |
| 5 | 1645056 |
| 6 | 16045056 |
| 7 | 110146176 |
| 8 | 584713404 |
| 9 | 2549741568 |
| 10 | 9515943936 |
| 11 | 31314087864 |
| 12 | 92917622376 |
| 13 | 252775586304 |
| 14 | 638328674304 |
| 15 | 1511740886400 |
| 16 | 3387163161366 |
| 17 | 7228598851584 |