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A074188 as a simple table

na(n)
11
24
38
425
5121
6729
75041
840401
9363609
103629025
1139917124
12479040769
136227103744
1487178467600
151307674583296
1620922793332736
17355687454263684
186402373820077225
19121645100663836929
202432902009335560361

[1,4,8,25,121,729,5041,40401,363609,3629025,
 39917124,479040769,6227103744,87178467600,
 1307674583296,20922793332736,355687454263684,
 6402373820077225,121645100663836929,
 2432902009335560361]