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A167558 as a simple table

na(n)
21
312
4160
52688
655296
71351680
838338560
91238630400
1044920995840
111807409479680
1279906524364800
133850733459865600
14200907832688640000
1511282983883794022400
16678650586195610828800
1743527244493925384192000

[1,12,160,2688,55296,1351680,38338560,1238630400,
 44920995840,1807409479680,79906524364800,
 3850733459865600,200907832688640000,
 11282983883794022400,678650586195610828800,
 43527244493925384192000]