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A240801 as a simple table

na(n)
21
31
43
53
612
712
815
975
10120
1160
12105
13630
141350
151200
16360
17945
186615
1917640
2022050
2112600
222520

[1,1,3,3,12,12,15,75,120,60,105,630,1350,1200,360,
 945,6615,17640,22050,12600,2520]