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A147420
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
9
7
23
8
64
9
295
10
1072
11
4637
12
27060
13
195073
14
1617157
15
15822995
16
190207942
17
2553434864
18
40752029560
[1,1,1,1,1,9,23,64,295,1072,4637,27060,195073, 1617157,15822995,190207942,2553434864,40752029560]
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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)