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A109551 as a simple table

na(n)
12
23
35
411
523
643
7211
81123
92345543
104321123
1111234554321
12432112345543
132345543211234554321
14112345543211234554321
154321123455432112345543
164321123455432112345543211
1755432112345543211234554321

[2,3,5,11,23,43,211,1123,2345543,4321123,
 11234554321,432112345543,2345543211234554321,
 112345543211234554321,4321123455432112345543,
 4321123455432112345543211,
 55432112345543211234554321]