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A141052 as a simple table

na(n)
21
34
421
5130
6930
77560
868880
9695520
107711200
1193139200
121217462400
1317124307200
14257902444800
154140968832000
1670614415872000
171274546617344000
1824275666967552000
19486580401635328000
2010238462617743360000
21225651661258383360000
225198503365971435520000

[1,4,21,130,930,7560,68880,695520,7711200,
 93139200,1217462400,17124307200,257902444800,
 4140968832000,70614415872000,1274546617344000,
 24275666967552000,486580401635328000,
 10238462617743360000,225651661258383360000,
 5198503365971435520000]