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A107958
as a simple table
n
a(n)
0
1
1
3
2
11
3
52
4
331
5
2949
6
38069
7
733817
8
21670554
9
1001901607
10
73852354365
11
8813580443406
12
1725174170633694
[1,3,11,52,331,2949,38069,733817,21670554, 1001901607,73852354365,8813580443406, 1725174170633694]