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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”).

A268393 as a simple table

na(n)
11
22
34
48
515
628
752
899
9193
10377
11739
121459
132908
145799
1511537
1623021
1745971
1891857
19183513

[1,2,4,8,15,28,52,99,193,377,739,1459,2908,5799,
 11537,23021,45971,91857,183513]