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A049369
as a simple table
n
a(n)
1
0
2
1
3
2
4
7
5
22
6
109
7
680
8
6144
9
72887
10
1061063
11
17540092
12
314631443
[0,1,2,7,22,109,680,6144,72887,1061063,17540092, 314631443]