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A373286 as a simple table

na(n)
11
21
31
41
516
648
764
816
9784
10233280
11291600
1220736
13167961600
14281014272
1574649600
161679616
173229640294400
182472693350400
19511642685030400
202751882854400
214854321355161600
222085841207296000000
23216982220508758016
2415850845241344
2525975097361564696576

[1,1,1,1,16,48,64,16,784,233280,291600,20736,
 167961600,281014272,74649600,1679616,
 3229640294400,2472693350400,511642685030400,
 2751882854400,4854321355161600,
 2085841207296000000,216982220508758016,
 15850845241344,25975097361564696576]