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A146045 as a simple table

na(n)
11
21
31
45
517
649
7267
81635
915439
10178481
112706563
1252897007
131344799359
1442695435337
151933850526571
16106233098774339

[1,1,1,5,17,49,267,1635,15439,178481,2706563,
 52897007,1344799359,42695435337,1933850526571,
 106233098774339]