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A266549 as a simple table

na(n)
10
21
31
43
56
625
786
8414
91975
1010479
1156572
12316577
131800363
1410419605
1561061169
16361978851

[0,1,1,3,6,25,86,414,1975,10479,56572,316577,
 1800363,10419605,61061169,361978851]