A166326 - OEIS

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A166326 as a simple table

n	a(n)
1	-1
2	17
3	7849
4	3667649
5	2395420006033
6	3143661612445145
7	11877172892329028459041
8	32347093457545958193355601
9	424678439961073471604787362241217

[-1,17,7849,3667649,2395420006033, 3143661612445145,11877172892329028459041, 32347093457545958193355601, 424678439961073471604787362241217]