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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”).

A138016 as a simple table

na(n)
11
22
34
46
510
614
724
834
968
10102
11256
12410
131284
142158
158072
1613986

[1,2,4,6,10,14,24,34,68,102,256,410,1284,2158,
 8072,13986]