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A071972
as a simple table
n
a(n)
1
1
2
15
3
1339
4
6069
5
28879
6
40941
7
66183
8
77707
9
1359489
10
1651008
11
7923801
12
16146690
13
22400968
[1,15,1339,6069,28879,40941,66183,77707,1359489, 1651008,7923801,16146690,22400968]