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A049371
as a simple table
n
a(n)
1
0
2
0
3
0
4
1
5
2
6
9
7
46
8
386
9
3900
10
48766
11
670392
12
9845024
[0,0,0,1,2,9,46,386,3900,48766,670392,9845024]