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A087814
as a simple table
n
a(n)
0
1
1
1
2
13
3
15
4
25
5
39
6
47
7
51
8
69
9
81
10
101
11
139
12
249
13
261
14
275
15
291
16
739
17
1243
18
2243
[1,1,13,15,25,39,47,51,69,81,101,139,249,261,275, 291,739,1243,2243]