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A048608 as a simple table

na(n)
01
14
248
396
43840
530720
613440
72064384
892897280
9594542592
10130799370240
111121137459200
1240809403514880
13816188070297600
1448971284217856000
155484783832399872000
1662160883433865216000
171918107260244983808000

[1,4,48,96,3840,30720,13440,2064384,92897280,
 594542592,130799370240,1121137459200,
 40809403514880,816188070297600,48971284217856000,
 5484783832399872000,62160883433865216000,
 1918107260244983808000]