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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 16 |
| 5 | 80 |
| 6 | 360 |
| 7 | 1680 |
| 8 | 8064 |
| 9 | 39872 |
| 10 | 209920 |
| 11 | 1168640 |
| 12 | 6779520 |
| 13 | 41403648 |
| 14 | 265434624 |
| 15 | 1765487360 |
| 16 | 12227461120 |
| 17 | 88163164160 |
| 18 | 656547803136 |
| 19 | 5054718763008 |
| 20 | 40261284495360 |
| 21 | 330010833797120 |
| 22 | 2783003768258560 |
| 23 | 24166721457815552 |
| 24 | 215318925878132736 |
| 25 | 1966855934150246400 |
[0,0,0,2,16,80,360,1680,8064,39872,209920,1168640, 6779520,41403648,265434624,1765487360,12227461120, 88163164160,656547803136,5054718763008, 40261284495360,330010833797120,2783003768258560, 24166721457815552,215318925878132736, 1966855934150246400] |