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A253860 as a simple table

na(n)
1660480
222951616
3700079360
421906994304
5664082571648
620237970640000
7612253982192000
818456265054053248
9555946540182616960
1016764356653623013760
11504825246424517334912
1215215766421703812450176

[660480,22951616,700079360,21906994304,
 664082571648,20237970640000,612253982192000,
 18456265054053248,555946540182616960,
 16764356653623013760,504825246424517334912,
 15215766421703812450176]