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A008575
as a simple table
n
a(n)
1
1
2
18
3
4
4
13
5
6
6
10
7
15
8
2
9
17
10
3
11
19
12
7
13
16
14
8
15
11
16
14
17
9
18
12
19
5
20
20
21
25
22
50
[1,18,4,13,6,10,15,2,17,3,19,7,16,8,11,14,9,12,5, 20,25,50]