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A280020 as a simple table

na(n)
11
21
33
47
527
6211
71743
815247
9219747
105379451
11154297863
125085738967
13225515577147
1414272681411171

[1,1,3,7,27,211,1743,15247,219747,5379451,
 154297863,5085738967,225515577147,14272681411171]