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A196925
as a simple table
n
a(n)
1
1
2
1
3
2
4
7
5
65
6
1242
7
55546
8
5603265
9
1280956817
10
661075536443
11
771059112373171
12
2031433178217758354
[1,1,2,7,65,1242,55546,5603265,1280956817, 661075536443,771059112373171,2031433178217758354]