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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”).

A003527 as a simple table

na(n)
11
23
35
415
517
651
785
8255
9257
10771
111285
123855
134369
1413107
1521845
1665535

[1,3,5,15,17,51,85,255,257,771,1285,3855,4369,
 13107,21845,65535]