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A239698 as a simple table

na(n)
10
22
36
411
518
625
735
845
956
1069
1183
1297
13115
14131
15150
16169
17189
18212
19234
20258
21284

[0,2,6,11,18,25,35,45,56,69,83,97,115,131,150,169,
 189,212,234,258,284]