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A007084
as a simple table
n
a(n)
2
0
3
0
4
0
5
0
6
1
7
1
8
1
9
4
10
5
11
14
12
28
13
86
14
211
15
648
16
1878
17
5931
18
18326
19
58746
20
187620
21
608065
22
1975191
23
6461809
24
21212414
[0,0,0,0,1,1,1,4,5,14,28,86,211,648,1878,5931, 18326,58746,187620,608065,1975191,6461809, 21212414]
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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)