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A146404 as a simple table

na(n)
11
21
31
41
55
625
763
8357
91891
1012499
11113287
121385821
1319264611
14381162993
158433132619

[1,1,1,1,5,25,63,357,1891,12499,113287,1385821,
 19264611,381162993,8433132619]