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A168251 as a simple table

na(n)
00
11
24
39
464
525
6576
749
84096
981
1025600
11121
12147456
13169
14802816
15225
164194304
17289
1821233664
19361
20104857600
21441
22507510784
23529
242415919104
25625
2611341398016
27729
2852613349376
29841
30241591910400
31961
321099511627776
331089
344964982194176
351225

[0,1,4,9,64,25,576,49,4096,81,25600,121,147456,
 169,802816,225,4194304,289,21233664,361,104857600,
 441,507510784,529,2415919104,625,11341398016,729,
 52613349376,841,241591910400,961,1099511627776,
 1089,4964982194176,1225]