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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”).

A243788 as a simple table

na(n)
11
21
32
44
511
635
7124
8500
92224
1010640
1153920
12285535
131563849
148798306

[1,1,2,4,11,35,124,500,2224,10640,53920,285535,
 1563849,8798306]