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A051893 as a simple table

na(n)
11
21
35
450
5850
622100
7817700
840885000
92657525000
10217917050000
1122009622050000
122685173890100000
13389350214064500000
1466189536390965000000
1513039338669020105000000
162946890539198543730000000
17757350868574025738610000000
18219631751886467464196900000000

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