A015022 - OEIS

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A015022 as a simple table

n	a(n)
1	1
2	-7
3	-399
4	181545
5	661005345
6	-19253102683815
7	-4486300228074519855
8	8363069275661695069900425
9	124719129516554187174725699959425
10	-14879571721119777957252576955487113947975

[1,-7,-399,181545,661005345,-19253102683815, -4486300228074519855,8363069275661695069900425, 124719129516554187174725699959425, -14879571721119777957252576955487113947975]