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A300459
as a simple table
n
a(n)
1
0
2
1
3
2
4
28
5
1146
6
78195
7
17675111
8
9829599051
9
14061129641181
10
51771244646074395
[0,1,2,28,1146,78195,17675111,9829599051, 14061129641181,51771244646074395]