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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”).

A289471 as a simple table

na(n)
11
20
31
41
52
63
77
815
939
10106
11316
121030
133553
1413006
1549780
16197281
17804649
183358885
1914289507
2061769577

[1,0,1,1,2,3,7,15,39,106,316,1030,3553,13006,
 49780,197281,804649,3358885,14289507,61769577]