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A370656
as a simple table
n
a(n)
0
1
1
1
2
1
3
2
4
5
5
21
6
108
7
737
8
5795
9
53635
10
549777
11
6294420
[1,1,1,2,5,21,108,737,5795,53635,549777,6294420]
