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A246497
as a simple table
n
a(n)
1
3
2
7
3
23
4
47
5
283
6
719
7
1439
8
2879
9
34549
10
138197
11
1266767
12
14619833
13
36449279
14
377982107
15
1432349099
[3,7,23,47,283,719,1439,2879,34549,138197,1266767, 14619833,36449279,377982107,1432349099]