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A058481 as a simple table

na(n)
11
27
325
479
5241
6727
72185
86559
919681
1059047
11177145
12531439
131594321
144782967
1514348905
1643046719
17129140161
18387420487
191162261465
203486784399
2110460353201
2231381059607
2394143178825
24282429536479
25847288609441

[1,7,25,79,241,727,2185,6559,19681,59047,177145,
 531439,1594321,4782967,14348905,43046719,
 129140161,387420487,1162261465,3486784399,
 10460353201,31381059607,94143178825,282429536479,
 847288609441]