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A197786 as a simple table

n a(n)
1 1
2 4
3 18
4 209
5 4988
6 221443
7 19332957
8 3266183233
9 1068404830615
10 677798120112881
11 833288676199771911 

[1,4,18,209,4988,221443,19332957,3266183233,
 1068404830615,677798120112881,833288676199771911]

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Last modified July 28 00:45 EDT 2024. Contains 374674 sequences. (Running on oeis4.)