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A220530
as a simple table
n
a(n)
1
2
2
27
3
274
4
2660
5
23948
6
204634
7
1697940
8
13869434
9
112203992
10
902932630
11
7245817986
12
58059100355
[2,27,274,2660,23948,204634,1697940,13869434, 112203992,902932630,7245817986,58059100355]
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Last modified September 3 16:57 EDT 2024. Contains 375672 sequences. (Running on oeis4.)