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A055206
as a simple table
n
a(n)
1
1
2
2
3
15
4
65
5
434
6
2994
7
21837
8
167032
9
1328401
10
10801518
11
89648445
12
756279950
[1,2,15,65,434,2994,21837,167032,1328401,10801518, 89648445,756279950]