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A000897 as a simple table

na(n)
01
112
2420
318480
4900900
546558512
62498640144
7137680171200
87735904619300
9441233078286000
1025467973278667920
111484298740174927040
1287202550985276963600
135157850293780050462400
14306839461354466267304000
1518344908596179023234548480

[1,12,420,18480,900900,46558512,2498640144,
 137680171200,7735904619300,441233078286000,
 25467973278667920,1484298740174927040,
 87202550985276963600,5157850293780050462400,
 306839461354466267304000,
 18344908596179023234548480]