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A166741 as a simple table

na(n)
01
12
24
310
432
5130
6640
73770
825600
9199810
101740800
1116983850
12181043200
132122981250
1426794393600
15367275756250
165358878720000
1784106148181250
181393308467200000
1924643101417106250
20457005177241600000

[1,2,4,10,32,130,640,3770,25600,199810,1740800,
 16983850,181043200,2122981250,26794393600,
 367275756250,5358878720000,84106148181250,
 1393308467200000,24643101417106250,
 457005177241600000]