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A045661 as a simple table

na(n)
12
29
316
4100
536
61225
764
82916
9600
105929
11144
12529984
13196
1418225
1516384
16231200
17324
183538161
19400
205143824
2148400
2289401
23576
241482250000
256760
26164025
27112896
2826050816
29900
305679280321
311024
3250808384
33226576
34442225

[2,9,16,100,36,1225,64,2916,600,5929,144,529984,
 196,18225,16384,231200,324,3538161,400,5143824,
 48400,89401,576,1482250000,6760,164025,112896,
 26050816,900,5679280321,1024,50808384,226576,
 442225]