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A273116
as a simple table
n
a(n)
0
1
1
5
2
17
3
41
4
189
5
977
6
4013
7
14577
8
60617
9
241005
10
964021
11
3841653
12
15349713
13
61414133
14
245738437
15
982690957
[1,5,17,41,189,977,4013,14577,60617,241005,964021, 3841653,15349713,61414133,245738437,982690957]