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A131978 as a simple table

na(n)
11
21
31
44
54
624
724
8192
91728
1017280
1117280
12207360
13207360
14414720
156220800
1699532800
17696729600
1812541132800
1912541132800
20250822656000
215267275776000
2210534551552000
2310534551552000
24252829237248000
251264146186240000
2612641461862400000
273754514173132800000

[1,1,1,4,4,24,24,192,1728,17280,17280,207360,
 207360,414720,6220800,99532800,696729600,
 12541132800,12541132800,250822656000,
 5267275776000,10534551552000,10534551552000,
 252829237248000,1264146186240000,
 12641461862400000,3754514173132800000]