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A089140 as a simple table

na(n)
12
24
38
415
526
640
760
884
9114
10149
11190
12234
13288
14346
15411
16484
17565
18649
19743
20840
21947
221063
231185

[2,4,8,15,26,40,60,84,114,149,190,234,288,346,411,
 484,565,649,743,840,947,1063,1185]