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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 360 |
| 7 | 7560 |
| 8 | 95760 |
| 9 | 952560 |
| 10 | 8217720 |
| 11 | 64614960 |
| 12 | 476514360 |
| 13 | 3355664760 |
| 14 | 22837086720 |
| 15 | 151449482520 |
| 16 | 984573465120 |
| 17 | 6302069010720 |
| 18 | 39847409421480 |
| 19 | 249509368422720 |
| 20 | 1550188394120520 |
| 21 | 9570844541994120 |
| 22 | 58789922099665680 |
| 23 | 359629148397511080 |
| 24 | 2192484972513916080 |
| 25 | 13329510116645202480 |
| 26 | 80854267307329446840 |
| 27 | 489528474458978944080 |
| 28 | 2959252601445086408280 |
| 29 | 17866194139995100525080 |
| 30 | 107751636988750077294240 |
| 31 | 649286502010403671101240 |
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