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A014479 as a simple table

na(n)
01
18
272
3768
49600
5138240
62257920
741287680
8836075520
918579456000
10449622835200
1111771943321600
12331576403558400
139998303861145600
14321374052679680000
1510969567664799744000
16396275631890890752000

[1,8,72,768,9600,138240,2257920,41287680,
 836075520,18579456000,449622835200,11771943321600,
 331576403558400,9998303861145600,
 321374052679680000,10969567664799744000,
 396275631890890752000]