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A331042 as a simple table

na(n)
10
20
33
47
512
615
732
835
955
1063
1195
12119
13135
14224
15231
16255
17320
18351
19455
20495
21855
22864
23896
241071
251440

[0,0,3,7,12,15,32,35,55,63,95,119,135,224,231,255,
 320,351,455,495,855,864,896,1071,1440]