A012122 - OEIS

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A012122 as a simple table

n	a(n)
0	1
1	-1
2	5
3	-109
4	4073
5	-295161
6	30105261
7	-4622444709
8	920180967249
9	-244553774342769
10	80285311139524821
11	-32887829518696856925
12	16096767138947015536185
13	-9423401435342942243589225

[1,-1,5,-109,4073,-295161,30105261,-4622444709, 920180967249,-244553774342769,80285311139524821, -32887829518696856925,16096767138947015536185, -9423401435342942243589225]