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A007288
as a simple table
n
a(n)
0
1
1
3
2
7
3
19
4
49
5
127
6
321
7
813
8
2041
9
5117
10
12763
11
31791
12
78917
13
195677
14
483997
15
1196081
16
2950439
17
7271905
[1,3,7,19,49,127,321,813,2041,5117,12763,31791, 78917,195677,483997,1196081,2950439,7271905]