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A369111
as a simple table
n
a(n)
1
2
2
12
3
65
4
388
5
2708
6
19969
7
155369
8
1250182
9
10345920
10
87545946
11
753285178
12
6571105993
[2,12,65,388,2708,19969,155369,1250182,10345920, 87545946,753285178,6571105993]