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A066410 as a simple table

na(n)
115
2252
33048
434560
5403200
64390848
745732192
8487710720
95079674880
1052124083200
11542890252800
125618427494400
1358517854617600
14591272607744000
156026281863275520
1660762014342184960
17623846047297536000
186394202229664972800
1964417520701204070400
20652677739551129600000

[15,252,3048,34560,403200,4390848,45732192,
 487710720,5079674880,52124083200,542890252800,
 5618427494400,58517854617600,591272607744000,
 6026281863275520,60762014342184960,
 623846047297536000,6394202229664972800,
 64417520701204070400,652677739551129600000]