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A112491 as a simple table

na(n)
5945
645045
71406790
837147110
9909508600
1021577556000
11508072685120
1212041790080320
13289769457978000
147118294418969552
15179128660433168160
164627741977903371040
17122904955276454869056
183358132932795227294400

[945,45045,1406790,37147110,909508600,21577556000,
 508072685120,12041790080320,289769457978000,
 7118294418969552,179128660433168160,
 4627741977903371040,122904955276454869056,
 3358132932795227294400]