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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”).

A121949 as a simple table

na(n)
11
22
310
443
5210
61026
75130
825770
9130350
10661458

[1,2,10,43,210,1026,5130,25770,130350,661458]