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A007216
as a simple table
n
a(n)
0
1
1
0
2
4
3
0
4
16
5
24
6
122
7
348
8
1266
9
4464
10
16394
11
57932
12
215916
13
828348
[1,0,4,0,16,24,122,348,1266,4464,16394,57932, 215916,828348]