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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”).

A291555 as a simple table

na(n)
10
21
34
415
540
657
776
8108
9146
10194
11258
12336
13447
14544
15663
16807
17970
181132
191333
201567

[0,1,4,15,40,57,76,108,146,194,258,336,447,544,
 663,807,970,1132,1333,1567]