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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”).

A215394 as a simple table

na(n)
11
21
31
43
56
627
799
8463
92233
1011875
1166925
12402364
132555606
1417115329
15120368115
16886510373
176819231506

[1,1,1,3,6,27,99,463,2233,11875,66925,402364,
 2555606,17115329,120368115,886510373,6819231506]