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A056689
as a simple table
n
a(n)
1
0
2
1
3
2
4
4
5
8
6
11
7
14
8
20
9
263
10
382
11
2719
12
4493
13
21166
14
45824
15
55850
16
64567
17
70726
[0,1,2,4,8,11,14,20,263,382,2719,4493,21166,45824, 55850,64567,70726]