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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”).

A032558 as a simple table

na(n)
11
21
31
41
51
61
71
81
91
102
112
122
136
146
156
168
178
188
198
2010
2110
2210
2313
2413
2513
2613
2716
2816

[1,1,1,1,1,1,1,1,1,2,2,2,6,6,6,8,8,8,8,10,10,10,
 13,13,13,13,16,16]