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A007704 as a simple table

na(n)
12
23
34
49
528
6225
76076
81361025
98268226876
1011253255215681025
1193044467205527772332546876
121047053135870867396062743192203958743681025

[2,3,4,9,28,225,6076,1361025,8268226876,
 11253255215681025,93044467205527772332546876,
 1047053135870867396062743192203958743681025]