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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”).

A306424 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1112
1213
1314
1416
1517
1620
1722
1823
1925
2026
2131
2237
2343

[1,2,3,4,5,6,7,8,9,10,12,13,14,16,17,20,22,23,25,
 26,31,37,43]