A012024 - OEIS

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A012024 as a simple table

n	a(n)
1	1
2	-2
3	16
4	-104
5	-20096
6	4427776
7	-954111872
8	243390205696
9	-75389245067264
10	28248828019830784
11	-12669814369258471424
12	6721694045416881553408
13	-4170436153219300846567424
14	2994608522937575414450814976

[1,-2,16,-104,-20096,4427776,-954111872, 243390205696,-75389245067264,28248828019830784, -12669814369258471424,6721694045416881553408, -4170436153219300846567424, 2994608522937575414450814976]