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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”).

A003891 as a simple table

na(n)
11
215
315
430
530
630
730
830
930
1030
1131
1232
1332
1432
1532
1632
1732
1832

[1,15,15,30,30,30,30,30,30,30,31,32,32,32,32,32,
 32,32]