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A355989 as a simple table

na(n)
21
33
46
530
660
7420
8840
97560
1015120
11166320
12332640
134324320
148648640
15129729600
16259459200
174410806400
188821612800
19167610643200
20335221286400
217039647014400
2214079294028800
23323823762662400
24647647525324800
2516191188133120000
2632382376266240000

[1,3,6,30,60,420,840,7560,15120,166320,332640,
 4324320,8648640,129729600,259459200,4410806400,
 8821612800,167610643200,335221286400,
 7039647014400,14079294028800,323823762662400,
 647647525324800,16191188133120000,
 32382376266240000]