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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”).

A051250 as a simple table

na(n)
11
22
33
44
55
66
78
89
910
1012
1114
1218
1320
1424
1530
1642
1760

[1,2,3,4,5,6,8,9,10,12,14,18,20,24,30,42,60]