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A219894
as a simple table
n
a(n)
5
1
6
4
7
9
8
55
9
453
10
4357
11
47598
12
569769
13
7371560
14
102525991
15
1525164223
[1,4,9,55,453,4357,47598,569769,7371560,102525991, 1525164223]