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A171339
as a simple table
n
a(n)
1
1
2
2
3
6
4
22
5
118
6
656
7
4586
8
36656
9
332050
10
3326146
11
36615032
12
439501232
13
5741754786
14
80586187678
[1,2,6,22,118,656,4586,36656,332050,3326146, 36615032,439501232,5741754786,80586187678]