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A004136
as a simple table
n
a(n)
1
1
2
3
3
7
4
13
5
21
6
31
7
48
8
57
9
73
10
91
11
120
12
133
13
168
14
183
15
255
16
255
17
273
18
307
[1,3,7,13,21,31,48,57,73,91,120,133,168,183,255, 255,273,307]
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Last modified August 30 07:09 EDT 2024. Contains 375532 sequences. (Running on oeis4.)