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A139491 as a simple table

na(n)
13
28
39
412
515
616
721
824
940
1045
1148
1260
1372
14120
15168
16240
17840
181848

[3,8,9,12,15,16,21,24,40,45,48,60,72,120,168,240,
 840,1848]