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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”).

A136996 as a simple table

na(n)
11
22
311
412
521
6421
71214171
82777177421

[1,2,11,12,21,421,1214171,2777177421]