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A275943
as a simple table
n
a(n)
1
1
2
2
3
6
4
19
5
61
6
197
7
640
8
2091
9
6860
10
22566
11
74365
12
245397
13
810639
14
2680025
15
8865866
[1,2,6,19,61,197,640,2091,6860,22566,74365,245397, 810639,2680025,8865866]