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A119813
as a simple table
n
a(n)
1
0
2
1
3
6
4
18
5
1032
6
16777344
7
288230376151842816
8
1393796574908163946345982392042721617379328
[0,1,6,18,1032,16777344,288230376151842816, 1393796574908163946345982392042721617379328]