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A006755
as a simple table
n
a(n)
0
0
1
2
2
3
3
4
4
8
5
14
6
25
7
47
8
86
9
164
10
314
11
603
12
1159
13
2271
14
4456
15
8748
16
17182
17
33761
18
66919
19
132679
20
263087
[0,2,3,4,8,14,25,47,86,164,314,603,1159,2271,4456, 8748,17182,33761,66919,132679,263087]