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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 28 |
| 6 | 424 |
| 7 | 5318 |
| 8 | 60761 |
| 9 | 648780 |
| 10 | 6576432 |
| 11 | 64778166 |
| 12 | 626694626 |
| 13 | 5994718578 |
| 14 | 56938020205 |
| 15 | 538418118750 |
| 16 | 5078038454782 |
| 17 | 47824516913862 |
| 18 | 450132198653881 |