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A215873 as a simple table

n a(n)
1 1
2 1
3 1
4 4
5 20
6 189
7 1642
8 26451
9 307874
10 7027942
11 98057806
12 2850280812
13 44974137856 

[1,1,1,4,20,189,1642,26451,307874,7027942,
 98057806,2850280812,44974137856]

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Last modified May 23 15:34 EDT 2024. Contains 372763 sequences. (Running on oeis4.)