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A093991
as a simple table
n
a(n)
1
1
2
0
3
4
4
2
5
30
6
24
7
280
8
278
9
2841
10
3256
11
30324
12
38830
13
334540
[1,0,4,2,30,24,280,278,2841,3256,30324,38830, 334540]
