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A092639
as a simple table
n
a(n)
1
0
2
2
3
14
4
116
5
780
6
6066
7
49510
8
417230
9
3631524
10
32070665
11
287366058
[0,2,14,116,780,6066,49510,417230,3631524, 32070665,287366058]