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A143497 as a simple table

na(n)
21
34
41
520
610
71
8120
990
1018
111
12840
13840
14252
1528
161
176720
188400
193360
20560
2140
221
2360480
2490720
2545360
2610080
271080
2854
291
30604800
311058400
32635040
33176400
3425200
351890
3670
371
386652800
3913305600
409313920
413104640
42554400
4355440
443080
4588
461

[1,4,1,20,10,1,120,90,18,1,840,840,252,28,1,6720,
 8400,3360,560,40,1,60480,90720,45360,10080,1080,
 54,1,604800,1058400,635040,176400,25200,1890,70,1,
 6652800,13305600,9313920,3104640,554400,55440,
 3080,88,1]