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A036237
as a simple table
n
a(n)
0
1
1
2
2
5
3
4
4
7
5
10
6
15
7
8
8
11
9
14
10
13
11
28
12
21
13
78
14
17
15
16
16
19
17
22
18
49
19
42
20
23
21
26
22
1577
23
40
[1,2,5,4,7,10,15,8,11,14,13,28,21,78,17,16,19,22, 49,42,23,26,1577,40]