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A229161
as a simple table
n
a(n)
1
0
2
1
3
1
4
2
5
5
6
13
7
42
8
155
9
636
10
2889
11
14321
12
76834
13
443157
[0,1,1,2,5,13,42,155,636,2889,14321,76834,443157]