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A105493 as a simple table

n a(n)
9 2
10 20
11 170
12 1340
13 10375
14 80652
15 636990
16 5143740
17 42613980
18 362863600
19 3178544754
20 28650249848

[2,20,170,1340,10375,80652,636990,5143740,
 42613980,362863600,3178544754,28650249848]

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)