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A305580 as a simple table

n a(n)
1 1
2 4
3 6
4 15
5 76
6 1897
7 50618
8 1944635
9 206386330
10 39654762470
11 12122540208729
12 7706375033488022
13 9485494637120246765
14 20755111336456755801193

[1,4,6,15,76,1897,50618,1944635,206386330,
 39654762470,12122540208729,7706375033488022,
 9485494637120246765,20755111336456755801193]

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Last modified September 25 16:45 EDT 2020. Contains 337344 sequences. (Running on oeis4.)