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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”).

A018276 as a simple table

na(n)
11
22
33
44
56
67
712
814
921
1028
1142
1284

[1,2,3,4,6,7,12,14,21,28,42,84]