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A091587
as a simple table
n
a(n)
0
1
1
3
2
9
3
24
4
67
5
196
6
581
7
1731
8
5180
9
15534
10
46578
11
139713
12
419116
[1,3,9,24,67,196,581,1731,5180,15534,46578,139713, 419116]