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A000407 as a simple table

na(n)
01
16
260
3840
415120
5332640
68648640
7259459200
88821612800
9335221286400
1014079294028800
11647647525324800
1232382376266240000
131748648318376960000
14101421602465863680000
156288139352883548160000
16415017197290314178560000

[1,6,60,840,15120,332640,8648640,259459200,
 8821612800,335221286400,14079294028800,
 647647525324800,32382376266240000,
 1748648318376960000,101421602465863680000,
 6288139352883548160000,415017197290314178560000]