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A321470
as a simple table
n
a(n)
0
1
1
1
2
2
3
5
4
16
5
54
6
212
7
834
8
3558
9
15394
10
69512
11
313107
12
1474095
13
6877031
14
32877196
[1,1,2,5,16,54,212,834,3558,15394,69512,313107, 1474095,6877031,32877196]