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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”).

A158921 as a simple table

na(n)
11
22
33
48
517
631
751
8112
9234
10464
11931
121855
133687
144877

[1,2,3,8,17,31,51,112,234,464,931,1855,3687,4877]