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A243559
as a simple table
n
a(n)
1
1
2
1
3
2
4
5
5
9
6
26
7
80
8
340
9
1690
10
11432
11
101142
12
1228608
13
20329150
[1,1,2,5,9,26,80,340,1690,11432,101142,1228608, 20329150]