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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”).

A304927 as a simple table

na(n)
11
25
313
473
5452
62653
715993
8118024
9920997
1012184613
11162877680
122507024025
1336984184204
14682363665419

[1,5,13,73,452,2653,15993,118024,920997,12184613,
 162877680,2507024025,36984184204,682363665419]