A331691 - OEIS

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A331691 as a simple table

n	a(n)
0	1
1	2
2	-16
3	2048
4	-67108864
5	144115188075855872
6	-1329227995784915872903807060280344576
7	226156424291633194186662080095093570025917938800079226639565593765455331328

[1,2,-16,2048,-67108864,144115188075855872, -1329227995784915872903807060280344576, 22615642429163319418666208009509357002591793880007\ 9226639565593765455331328]