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A146405
as a simple table
n
a(n)
1
1
2
1
3
1
4
17
5
53
6
413
7
6475
8
139711
9
4765521
10
251545591
11
21612521501
12
2948268913163
[1,1,1,17,53,413,6475,139711,4765521,251545591, 21612521501,2948268913163]