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A307278
as a simple table
n
a(n)
1
0
2
1
3
21
4
38
5
66
6
518
7
845
8
12345679
9
172839506
10
445372913
11
1173450678278939
12
111222333444555666777889
[0,1,21,38,66,518,845,12345679,172839506, 445372913,1173450678278939, 111222333444555666777889]