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A073506
as a simple table
n
a(n)
1
1
2
7
3
42
4
310
5
2402
6
19665
7
166230
8
1440474
9
12712499
10
113765625
11
1029509448
12
9401979904
13
86516427946
[1,7,42,310,2402,19665,166230,1440474,12712499, 113765625,1029509448,9401979904,86516427946]