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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]