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A049209 as a simple table

na(n)
01
16
278
31560
442120
51432080
658715280
72818333440
8155008339200
99610517030400
10663125675097600
1150397551307417600
124182996758515660800
13376469708266409472000
1436517561701841718784000
153797826416991538753536000
16421558732286060801642496000

[1,6,78,1560,42120,1432080,58715280,2818333440,
 155008339200,9610517030400,663125675097600,
 50397551307417600,4182996758515660800,
 376469708266409472000,36517561701841718784000,
 3797826416991538753536000,
 421558732286060801642496000]