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A157399 as a simple table

na(n)
11
21
33
41
59
615
71
845
960
10105
111
12165
13600
14525
15945
161
17855
185250
196300
205670
2110395
221
233843
2439900
2591875
2679380
2772765
28135135
291
3021819
31391440
321164975
331323000
341164240
351081080
362027025
371

[1,1,3,1,9,15,1,45,60,105,1,165,600,525,945,1,855,
 5250,6300,5670,10395,1,3843,39900,91875,79380,
 72765,135135,1,21819,391440,1164975,1323000,
 1164240,1081080,2027025,1]