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A154131
as a simple table
n
a(n)
1
1
2
4
3
17
4
1738
5
1739
6
12863
7
15705
8
109705
9
174894
10
289047
11
720429
12
2087694
13
2087695
14
4475944
15
6968999
[1,4,17,1738,1739,12863,15705,109705,174894, 289047,720429,2087694,2087695,4475944,6968999]