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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”).

A256571 as a simple table

na(n)
11
26
321
456
5131
6281
7556
81046
91896
103346
115796
129916
1316806
1428316
1547506
1679476
17132706

[1,6,21,56,131,281,556,1046,1896,3346,5796,9916,
 16806,28316,47506,79476,132706]