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A071550 as a simple table

na(n)
01
140320
281729648000
3369398958888960000
42390461829733887910000000
518975581770994682860770223800320
6171889289584866507880743491472699801600

[1,40320,81729648000,369398958888960000,
 2390461829733887910000000,
 18975581770994682860770223800320,
 171889289584866507880743491472699801600]