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A051893 as a simple table

n a(n)
1 1
2 1
3 5
4 50
5 850
6 22100
7 817700
8 40885000
9 2657525000
10 217917050000
11 22009622050000
12 2685173890100000
13 389350214064500000
14 66189536390965000000
15 13039338669020105000000
16 2946890539198543730000000
17 757350868574025738610000000
18 219631751886467464196900000000

[1,1,5,50,850,22100,817700,40885000,2657525000,
 217917050000,22009622050000,2685173890100000,
 389350214064500000,66189536390965000000,
 13039338669020105000000,2946890539198543730000000,
 757350868574025738610000000,
 219631751886467464196900000000]

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Last modified April 26 09:52 EDT 2019. Contains 322472 sequences. (Running on oeis4.)