A123741 - OEIS

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A123741 as a simple table

n	a(n)
1	1
2	2
3	24
4	630
5	52800
6	11381760
7	6738443712
8	10487895163200
9	43294107630090240
10	469590163875486482400
11	13388418681612808458240000
12	1001088091286168023193223168000
13	196239953628635168336022309340569600

[1,2,24,630,52800,11381760,6738443712, 10487895163200,43294107630090240, 469590163875486482400,13388418681612808458240000, 1001088091286168023193223168000, 196239953628635168336022309340569600]