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A298178
as a simple table
n
a(n)
1
0
2
1
3
1
4
3
5
15
6
53
7
231
8
1948
9
15321
10
153043
11
2337091
12
40632357
13
844327333
14
25573081565
[0,1,1,3,15,53,231,1948,15321,153043,2337091, 40632357,844327333,25573081565]