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A249277 as a simple table

na(n)
01
12
224
348
45760
51280
6580608
71161216
81393459200
9398131200
10367873228800
11363331584
1224103053950976000
134382373445632000
14115694658964684800
1588995891511296000
16726206474732175360000
176455168664286003200

[1,2,24,48,5760,1280,580608,1161216,1393459200,
 398131200,367873228800,363331584,
 24103053950976000,4382373445632000,
 115694658964684800,88995891511296000,
 726206474732175360000,6455168664286003200]