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A321741 as a simple table

na(n)
11
21
31
41
52
62
72
86
918
1018
1118
1272
13432
141728
151728
161728
178640
1886400
19864000
204320000
214320000
224320000
2325920000
24388800000
257776000000
26116640000000
27699840000000
28699840000000
29699840000000
304898880000000
31102876480000000
323600676800000000
33126023688000000000
342646497448000000000
3518525482136000000000
3618525482136000000000

[1,1,1,1,2,2,2,6,18,18,18,72,432,1728,1728,1728,
 8640,86400,864000,4320000,4320000,4320000,
 25920000,388800000,7776000000,116640000000,
 699840000000,699840000000,699840000000,
 4898880000000,102876480000000,3600676800000000,
 126023688000000000,2646497448000000000,
 18525482136000000000,18525482136000000000]