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A141739
as a simple table
n
a(n)
0
1
1
3
2
5
3
8
4
14
5
18
6
23
7
31
8
39
9
47
10
55
11
65
12
74
13
86
14
98
15
113
16
131
17
145
18
161
19
177
20
193
21
209
22
227
23
243
24
260
[1,3,5,8,14,18,23,31,39,47,55,65,74,86,98,113,131, 145,161,177,193,209,227,243,260]