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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 156 |
| 7 | 15 |
| 8 | 14196 |
| 9 | 2730 |
| 10 | 140 |
| 11 | 984256 |
| 12 | 283920 |
| 13 | 29120 |
| 14 | 1050 |
| 15 | 57578976 |
| 16 | 22145760 |
| 17 | 3407040 |
| 18 | 245700 |
| 19 | 6951 |
| 20 | 2994106752 |
| 21 | 1439474400 |
| 22 | 295276800 |
| 23 | 31941000 |
| 24 | 1807260 |
| 25 | 42525 |
| 26 | 142719088512 |
| 27 | 82337935680 |
| 28 | 21112291200 |
| 29 | 3045042000 |
| 30 | 258438180 |
[1,156,15,14196,2730,140,984256,283920,29120,1050, 57578976,22145760,3407040,245700,6951,2994106752, 1439474400,295276800,31941000,1807260,42525, 142719088512,82337935680,21112291200,3045042000, 258438180] |