A262396 - OEIS

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A262396 as a simple table

n	a(n)
0	1
1	-1
2	1
3	64
4	4096
5	23323703841
6	63703464216016403230349121
7	316699666163357097153212433469030615484754548657341071360000

[1,-1,1,64,4096,23323703841, 63703464216016403230349121, 31669966616335709715321243346903061548475454865734\ 1071360000]