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A243787
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
14
6
52
7
228
8
1209
9
7463
10
52520
11
407856
12
3414672
13
30229061
14
279124327
[1,1,2,5,14,52,228,1209,7463,52520,407856,3414672, 30229061,279124327]