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A027160 as a simple table

na(n)
25
321
4176
5680
65808
721840
8190976
9708480
106310400
1123220736
12209756160
13767676416
147010676736
1525558732800
16235443322880
17855858053120
187939647995904
1928796047982592
20268690773770240
21972740537352192
229120760620646400

[5,21,176,680,5808,21840,190976,708480,6310400,
 23220736,209756160,767676416,7010676736,
 25558732800,235443322880,855858053120,
 7939647995904,28796047982592,268690773770240,
 972740537352192,9120760620646400]