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A077036
as a simple table
n
a(n)
1
11
2
60
3
61
4
1860
5
1861
6
1731660
7
1731661
8
1499324909460
9
1499324909461
[11,60,61,1860,1861,1731660,1731661,1499324909460, 1499324909461]