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A051918
as a simple table
n
a(n)
0
2
1
2
2
2
3
3
4
4
5
5
6
5
7
10
8
13
9
13
10
26
11
32
12
287
13
18380
14
21727
15
23205
16
24828
17
35646
18
48819
19
51476
[2,2,2,3,4,5,5,10,13,13,26,32,287,18380,21727, 23205,24828,35646,48819,51476]