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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”).

A156800 as a simple table

na(n)
11
21
32
44
510
635
7134
8777
96702
10104825
113370317
12231557290

[1,1,2,4,10,35,134,777,6702,104825,3370317,
 231557290]