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A186744 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 1
5 0
6 1
7 0
8 3
9 0
10 8
11 2
12 34
13 31
14 330
15 1607
16 17970
17 193906
18 2867269
19 32674056
20 1581626328
21 6705889815

[0,0,0,0,1,0,1,0,3,0,8,2,34,31,330,1607,17970,
 193906,2867269,32674056,1581626328,6705889815]

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Last modified March 29 05:39 EDT 2020. Contains 333105 sequences. (Running on oeis4.)