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A180836 as a simple table

n a(n)
1 1
2 1
3 9
4 72
5 678
6 7719
7 102963
8 1573764
9 27143466
10 521698683
11 11059018599
12 256349691978
13 6451098232944

[1,1,9,72,678,7719,102963,1573764,27143466,
 521698683,11059018599,256349691978,6451098232944]

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Last modified June 29 21:05 EDT 2022. Contains 354913 sequences. (Running on oeis4.)