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A198040 as a simple table

na(n)
11
21
31
425
5121
6409
728601
82265417
965067529
105916637353
112741353552969
12803210214721929

[1,1,1,25,121,409,28601,2265417,65067529,
 5916637353,2741353552969,803210214721929]