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A146461 as a simple table

na(n)
11
21
31
417
549
6361
76061
8172273
95274005
10274545571
1126127520797
123923980431021
13871070091426765

[1,1,1,17,49,361,6061,172273,5274005,274545571,
 26127520797,3923980431021,871070091426765]