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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 1 |
| 4 | 24 |
| 5 | 15 |
| 6 | 104 |
| 7 | 55 |
| 8 | 400 |
| 9 | 207 |
| 10 | 1632 |
| 11 | 31 |
| 12 | 8064 |
| 13 | 255 |
| 14 | 32384 |
| 15 | 11135 |
| 16 | 129280 |
| 17 | 41727 |
| 18 | 513536 |
| 19 | 152063 |
| 20 | 2058240 |
| 21 | 600063 |
| 22 | 8273920 |
| 23 | 2850815 |
| 24 | 33107968 |
| 25 | 11374591 |
| 26 | 132399104 |
| 27 | 43745279 |
| 28 | 533282816 |
| 29 | 168148991 |
| 30 | 2146729984 |
| 31 | 681213951 |
| 32 | 8406106112 |
| 33 | 2663972863 |
[1,0,6,1,24,15,104,55,400,207,1632,31,8064,255, 32384,11135,129280,41727,513536,152063,2058240, 600063,8273920,2850815,33107968,11374591, 132399104,43745279,533282816,168148991,2146729984, 681213951,8406106112,2663972863] |