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A239072 as a simple table

na(n)
00
11
22
35
47
511
615
721
826
932
1039
1147
1255
1364
1474
1585
1695
17107
18119
19132
20146
21160
22175
23191
24207
25224

[0,1,2,5,7,11,15,21,26,32,39,47,55,64,74,85,95,
 107,119,132,146,160,175,191,207,224]