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 | 0 |
| 6 | 0 |
| 7 | 2080 |
| 8 | 26032 |
| 9 | 172872 |
| 10 | 813072 |
| 11 | 3044712 |
| 12 | 9667152 |
| 13 | 27131344 |
| 14 | 68725744 |
| 15 | 160984560 |
| 16 | 351148064 |
| 17 | 725480624 |
| 18 | 1421692128 |