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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”).

A003889 as a simple table

na(n)
11
213
313
426
526
626
726
826
926
1027
1128
1228
1328
1428
1528
1628

[1,13,13,26,26,26,26,26,26,27,28,28,28,28,28,28]