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A022016
as a simple table
n
a(n)
0
1
1
1
2
4
3
12
4
47
5
174
6
749
7
3291
8
15675
9
78104
10
411042
11
2261961
12
13009112
13
77860234
[1,1,4,12,47,174,749,3291,15675,78104,411042, 2261961,13009112,77860234]