A009067 - OEIS

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A009067 as a simple table

n	a(n)
0	1
1	-1
2	-11
3	-253
4	-9911
5	-567449
6	-42551299
7	-3661191381
8	-252072060911
9	34332471915599
10	34386811167577477
11	19519494372343282899
12	10751436426722565995609
13	6281979864370292158301879

[1,-1,-11,-253,-9911,-567449,-42551299, -3661191381,-252072060911,34332471915599, 34386811167577477,19519494372343282899, 10751436426722565995609,6281979864370292158301879]