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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”).

A093668 as a simple table

na(n)
11
22
33
44
55
66
77
88
99
1010
1112
1213
1315
1416
1518
1621
1722
1824
1925
2028
2130
2233
2337
2440
2542
2645

[1,2,3,4,5,6,7,8,9,10,12,13,15,16,18,21,22,24,25,
 28,30,33,37,40,42,45]