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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”).

A280763 as a simple table

na(n)
11
21
32
46
518
675
7318
81599
98439
1048824
11300747
122030086
1315425065
14141798617

[1,1,2,6,18,75,318,1599,8439,48824,300747,2030086,
 15425065,141798617]