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A069695 as a simple table

na(n)
10
21
33
46
510
615
721
828
936
1045
1155
1266
1378
1491
15136
16231
17435
18630
19333336

[0,1,3,6,10,15,21,28,36,45,55,66,78,91,136,231,
 435,630,333336]