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A070523
as a simple table
n
a(n)
1
3
2
6
3
7
4
14
5
19
6
31
7
34
8
66
9
93
10
307
11
402
12
421
13
600
14
848
15
1022
16
1057
17
1906
18
3772
19
4184
20
4364
[3,6,7,14,19,31,34,66,93,307,402,421,600,848,1022, 1057,1906,3772,4184,4364]