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A090378
as a simple table
n
a(n)
0
1
1
3
2
7
3
19
4
53
5
147
6
409
7
1151
8
3255
9
9241
10
26267
11
74895
12
213775
13
611463
14
1750277
15
5017901
[1,3,7,19,53,147,409,1151,3255,9241,26267,74895, 213775,611463,1750277,5017901]