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A271140
as a simple table
n
a(n)
1
0
2
1
3
56
4
4899
5
797680
6
269282132
7
197805084468
8
321887622195271
9
1163415729672643756
[0,1,56,4899,797680,269282132,197805084468, 321887622195271,1163415729672643756]