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A240124
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
2
6
19
7
109
8
1781
9
13660
10
397689
11
5368943
12
289864745
[0,0,0,0,2,19,109,1781,13660,397689,5368943, 289864745]