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A005675
as a simple table
n
a(n)
1
1
2
2
3
8
4
18
5
55
6
138
7
470
8
1164
9
4055
10
10140
11
35609
12
89782
13
316513
14
803040
[1,2,8,18,55,138,470,1164,4055,10140,35609,89782, 316513,803040]
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Last modified April 24 19:59 EDT 2024. Contains 371963 sequences. (Running on oeis4.)