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) |
|---|---|
| 7 | 1 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 429 |
| 15 | 1430 |
| 16 | 3432 |
| 17 | 7072 |
| 18 | 13260 |
| 19 | 23256 |
| 20 | 38760 |
| 21 | 1447686 |
| 22 | 9241353 |
| 23 | 61760336 |
| 24 | 263673564 |
| 25 | 1154175880 |
| 26 | 4037346170 |
| 27 | 14498731260 |
| 28 | 58819097610 |
| 29 | 288661103640 |
| 30 | 1967198408955 |
| 31 | 12613467934524 |
| 32 | 82682367942144 |
| 33 | 480369377259200 |
| 34 | 2684682541268112 |