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A218964
as a simple table
n
a(n)
0
1
1
1
2
1
3
1
4
5
5
21
6
91
7
666
8
3851
9
30955
10
144691
11
1748836
12
27197611
13
313477451
[1,1,1,1,5,21,91,666,3851,30955,144691,1748836, 27197611,313477451]