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A033542 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 504 |
| 4 | 1153152 |
| 5 | 168275764800 |
| 6 | 2407165968578342400 |
| 7 | 4788742737385049982623884800 |
| 8 | 1780642079411485280163076498360356864000 |
| 9 | 159943989198524502594920793284078996733117111490560000 |
| 10 | 4353607386405822605116660595502838129080647848043621660449907712000000 |
[0,2,8,504,1153152,168275764800, 2407165968578342400,4788742737385049982623884800, 1780642079411485280163076498360356864000, 15994398919852450259492079328407899673311711149056\ 0000, 43536073864058226051166605955028381290806478480436\ 21660449907712000000] |