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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

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]