A074768 - OEIS

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A074768 as a simple table

n	a(n)
0	0
1	1
2	-4
3	42
4	-736
5	18200
6	-582624
7	22918672
8	-1069947904
9	57826348416
10	-3551472064000
11	244313618844416
12	-18609923667234816
13	1554954961060953088
14	-141407678375562489856
15	13904110871649987840000

[0,1,-4,42,-736,18200,-582624,22918672, -1069947904,57826348416,-3551472064000, 244313618844416,-18609923667234816, 1554954961060953088,-141407678375562489856, 13904110871649987840000]