A012097 - OEIS

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A012097 as a simple table

n	a(n)
0	1
1	1
2	1
3	49
4	-447
5	78561
6	-5655231
7	1014069393
8	-187639949439
9	51144433721793
10	-16631972691697791
11	6837287119716744945
12	-3357388632038371909695
13	1969419543279480607781025

[1,1,1,49,-447,78561,-5655231,1014069393, -187639949439,51144433721793,-16631972691697791, 6837287119716744945,-3357388632038371909695, 1969419543279480607781025]