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A369107
as a simple table
n
a(n)
1
4
2
26
3
201
4
1680
5
14902
6
135124
7
1243370
8
11587149
9
108941388
10
1031330156
11
9816605847
[4,26,201,1680,14902,135124,1243370,11587149, 108941388,1031330156,9816605847]