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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”).

A175810 as a simple table

na(n)
11
22
36
412
552
652
7116
8232
91864
101864
115960
125928
1315144
1415144
1531528
1663056
171008912
181008912
196199568
206199568

[1,2,6,12,52,52,116,232,1864,1864,5960,5928,15144,
 15144,31528,63056,1008912,1008912,6199568,6199568]