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A143491 as a simple table

na(n)
21
32
41
56
65
71
824
926
109
111
12120
13154
1471
1514
161
17720
181044
19580
20155
2120
221
235040
248028
255104
261665
27295
2827
291
3040320
3169264
3248860
3318424
344025
35511
3635
371
38362880
39663696
40509004
41214676
4254649
438624
44826
4544
461
473628800
486999840
495753736
502655764

[1,2,1,6,5,1,24,26,9,1,120,154,71,14,1,720,1044,
 580,155,20,1,5040,8028,5104,1665,295,27,1,40320,
 69264,48860,18424,4025,511,35,1,362880,663696,
 509004,214676,54649,8624,826,44,1,3628800,6999840,
 5753736,2655764]