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A182265
as a simple table
n
a(n)
1
2
2
9
3
31
4
176
5
1057
6
7422
7
53709
8
407198
9
3198946
10
25773602
11
212205881
12
1777532673
[2,9,31,176,1057,7422,53709,407198,3198946, 25773602,212205881,1777532673]