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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”).

A051918 as a simple table

na(n)
02
12
22
33
44
55
65
710
813
913
1026
1132
12287
1318380
1421727
1523205
1624828
1735646
1848819
1951476

[2,2,2,3,4,5,5,10,13,13,26,32,287,18380,21727,
 23205,24828,35646,48819,51476]