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A121813 as a simple table

n a(n)
1 0
2 1
3 1
4 1
5 1
6 4
7 13
8 121
9 8401
10 17724001
11 19980403610080
12 3017939125082738100693961
13 1069257489122187637992525695378883464262898201 

[0,1,1,1,1,4,13,121,8401,17724001,19980403610080,
 3017939125082738100693961,
 1069257489122187637992525695378883464262898201]

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Last modified May 1 12:36 EDT 2024. Contains 372170 sequences. (Running on oeis4.)