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A123472
as a simple table
n
a(n)
1
1
2
2
3
4
4
11
5
33
6
146
7
886
8
8483
9
126029
10
2866876
11
95717334
12
4534590984
[1,2,4,11,33,146,886,8483,126029,2866876,95717334, 4534590984]