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A174286
as a simple table
n
a(n)
1
0
2
0
3
0
4
0
5
1
6
3
7
19
8
75
9
291
10
985
11
3011
12
8659
13
24319
14
65899
15
176591
16
464451
17
1211185
[0,0,0,0,1,3,19,75,291,985,3011,8659,24319,65899, 176591,464451,1211185]