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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”).

A274003 as a simple table

na(n)
12
23
315
420
551
668
7255
8340
9771
101028
113855
125140
1313107
1417476
1565535
1687380
17196611
18262148
19983055

[2,3,15,20,51,68,255,340,771,1028,3855,5140,13107,
 17476,65535,87380,196611,262148,983055]