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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”).

A124266 as a simple table

na(n)
11
21
31
43
56
610
7150
8525
9980
1024696
11740880
122910600
1382328400
14168185160
151870592724

[1,1,1,3,6,10,150,525,980,24696,740880,2910600,
 82328400,168185160,1870592724]