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A123430
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
31
6
124
7
565
8
3162
9
19531
10
132566
11
961115
12
7402630
13
60209764
[1,2,4,11,31,124,565,3162,19531,132566,961115, 7402630,60209764]