A055326 - OEIS

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A055326 as a simple table

n	a(n)
1	1
2	-1
3	3
4	-23
5	425
6	-18129
7	1721419
8	-353654167
9	153923102577
10	-139765654884545
11	261831303051976691
12	-1003756293946036677111
13	7827579773381983088436313
14	-123626888505819540001029957073

[1,-1,3,-23,425,-18129,1721419,-353654167, 153923102577,-139765654884545,261831303051976691, -1003756293946036677111,7827579773381983088436313, -123626888505819540001029957073]