A012882 - OEIS

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A012882 as a simple table

n	a(n)
0	1
1	1
2	1
3	0
4	-3
5	20
6	165
7	784
8	1337
9	26256
10	356745
11	4466176
12	31874997
13	435729216
14	5714452653
15	104111460608
16	1296863374193
17	23261262303488
18	357091592679441
19	7794968497086464
20	131690816886952045

[1,1,1,0,-3,20,165,784,1337,26256,356745,4466176, 31874997,435729216,5714452653,104111460608, 1296863374193,23261262303488,357091592679441, 7794968497086464,131690816886952045]