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A039666 as a simple table

na(n)
11
23
315
430
535
656
770
878
9105
10140
11168
12190
13210
14248
15264
16357
17420
18570
19616
20630

[1,3,15,30,35,56,70,78,105,140,168,190,210,248,
 264,357,420,570,616,630]