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A057157
as a simple table
n
a(n)
0
0
1
2
2
232
3
16736896
4
18446723150919663616
5
1461501637330639787366751139186115801643772542976
[0,2,232,16736896,18446723150919663616, 1461501637330639787366751139186115801643772542976]