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A228762 as a simple table

n a(n)
3 1
4 0
5 1
6 0
7 7
8 0
9 39
10 0
11 419
12 0
13 7208
14 0
15 226512
16 0
17 7885970
18 0
19 345718580
20 0
21 18478915794
22 0

[1,0,1,0,7,0,39,0,419,0,7208,0,226512,0,7885970,0,
 345718580,0,18478915794,0]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)