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A124640
as a simple table
n
a(n)
0
1
1
3
2
11
3
33
4
98
5
270
6
736
7
1932
8
5009
9
12727
10
31977
11
79307
12
194947
[1,3,11,33,98,270,736,1932,5009,12727,31977,79307, 194947]