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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”).

A005646 as a simple table

na(n)
11
21
31
43
56
626
7122
81015
911847
10208914
115236991
12184321511

[1,1,1,3,6,26,122,1015,11847,208914,5236991,
 184321511]