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A111916
as a simple table
n
a(n)
2
1
3
2
4
5
5
18
6
80
7
475
8
3836
9
39555
10
495045
11
7159696
12
116040456
13
2068782009
14
40107422184
15
838931116609
[1,2,5,18,80,475,3836,39555,495045,7159696, 116040456,2068782009,40107422184,838931116609]
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Last modified April 25 05:18 EDT 2024. Contains 371964 sequences. (Running on oeis4.)
