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A322446
as a simple table
n
a(n)
1
5
2
74
3
776
4
7770
5
77794
6
778337
7
7784712
8
77833385
9
778307928
10
7783494530
[5,74,776,7770,77794,778337,7784712,77833385, 778307928,7783494530]