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A055547
as a simple table
n
a(n)
1
2
2
8
3
68
4
1124
5
36112
6
2263268
7
281249824
8
70329901860
9
35546752694048
[2,8,68,1124,36112,2263268,281249824,70329901860, 35546752694048]