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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”).

A145971 as a simple table

na(n)
11
21
31
41
59
69
754
893
9747
101903
1118738
1280363
131083847
146706491
15120203159
161028058854

[1,1,1,1,9,9,54,93,747,1903,18738,80363,1083847,
 6706491,120203159,1028058854]