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A292368
as a simple table
n
a(n)
1
1
2
21
3
55
4
385
5
49105
6
136081
7
701569
8
2830465
9
7996801
10
29158921
11
49268737
12
52617601
[1,21,55,385,49105,136081,701569,2830465,7996801, 29158921,49268737,52617601]