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A307069
as a simple table
n
a(n)
1
0
2
0
3
2
4
3
5
9
6
50
7
51
8
70
9
71
10
133
11
134
12
135
13
136
14
2543
15
2544
[0,0,2,3,9,50,51,70,71,133,134,135,136,2543,2544]