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A006142
as a simple table
n
a(n)
4
0
5
0
6
0
7
0
8
0
9
1
10
0
11
1
12
7
13
17
14
30
15
49
16
124
17
321
18
761
19
1721
20
3815
[0,0,0,0,0,1,0,1,7,17,30,49,124,321,761,1721,3815]
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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)