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A089946 as a simple table

na(n)
01
14
224
3200
42160
528812
6458752
78503056
8180000000
94287177620
10113515167744
113308603804376
12105288694411264
133632897460937500
14135107988821114880
155388090449900829728
16229385780960233586688
1710383890888434362036516
18498073600000000000000000

[1,4,24,200,2160,28812,458752,8503056,180000000,
 4287177620,113515167744,3308603804376,
 105288694411264,3632897460937500,
 135107988821114880,5388090449900829728,
 229385780960233586688,10383890888434362036516,
 498073600000000000000000]