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A038173
as a simple table
n
a(n)
1
1
2
1
3
4
4
20
5
131
6
1211
7
12734
8
144158
9
1687737
10
20196788
11
245366931
[1,1,4,20,131,1211,12734,144158,1687737,20196788, 245366931]