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A146649 as a simple table

na(n)
11
21
31
41
55
625
755
8257
91343
107017
1152361
12533979
135651335
1490178433
151487870527
1634319557235
17869941319597

[1,1,1,1,5,25,55,257,1343,7017,52361,533979,
 5651335,90178433,1487870527,34319557235,
 869941319597]