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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”).

A139490 as a simple table

na(n)
11
24
36
47
58
610
714
816
918
1022
1126
1238
1358
1482
1586

[1,4,6,7,8,10,14,16,18,22,26,38,58,82,86]