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A091920 as a simple table

n a(n)
1 7
2 11
3 0
4 1117
5 11117
6 0
7 1111447
8 11111117
9 0
10 1111111411
11 11111111741
12 0
13 1111111111177
14 11111111111411
15 0
16 1111111111111447
17 11111111111111171
18 0
19 1111111111111111111
20 11111111111111111447
21 0
22 1111111111111111111711

[7,11,0,1117,11117,0,1111447,11111117,0,
 1111111411,11111111741,0,1111111111177,
 11111111111411,0,1111111111111447,
 11111111111111171,0,1111111111111111111,
 11111111111111111447,0,1111111111111111111711]

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Last modified May 2 19:04 EDT 2024. Contains 372203 sequences. (Running on oeis4.)