A012874 - OEIS

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A012874 as a simple table

n	a(n)
1	0
2	1
3	-1
4	-2
5	6
6	33
7	-285
8	-30
9	13580
10	-35987
11	-1418445
12	14453470
13	125352282
14	-3470151531
15	-8211284081
16	1077876542834
17	-6851721057480
18	-332020513124583
19	5842787569074567
20	104612291816295422

[0,1,-1,-2,6,33,-285,-30,13580,-35987,-1418445, 14453470,125352282,-3470151531,-8211284081, 1077876542834,-6851721057480,-332020513124583, 5842787569074567,104612291816295422]