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A084664 as a simple table

na(n)
10
21
35
410
525
650
765
8100
9146
10250
11405
12500
13510
14521
15615
16650
17768
18945
19965
201000

[0,1,5,10,25,50,65,100,146,250,405,500,510,521,
 615,650,768,945,965,1000]