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| n | a(n) |
|---|---|
| 4 | 0 |
| 5 | 1 |
| 6 | 172 |
| 7 | 17041 |
| 8 | 1382400 |
| 9 | 104454120 |
| 10 | 7801139200 |
| 11 | 593322510704 |
| 12 | 46672464052224 |
| 13 | 3827977546598400 |
| 14 | 328664453612830720 |
| 15 | 29590252898580000000 |
| 16 | 2794588822832496508928 |
| 17 | 276747699113763664091136 |
| 18 | 28712738456619366481920000 |
| 19 | 3117500646133634877355274240 |
| 20 | 353783948741967872000000000000 |
[0,1,172,17041,1382400,104454120,7801139200, 593322510704,46672464052224,3827977546598400, 328664453612830720,29590252898580000000, 2794588822832496508928,276747699113763664091136, 28712738456619366481920000, 3117500646133634877355274240, 353783948741967872000000000000] |