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A121648 as a simple table

na(n)
01
11
21
34
49
525
664
7256
8729
92601
107921
1128900
1290000
13318096
141016064
153888784
1612694969
1746881409
18155825289
19592435600
201987643889
217408217041
2225153960000
2395823678916
24327811212304
251227814692624
264234507915264

[1,1,1,4,9,25,64,256,729,2601,7921,28900,90000,
 318096,1016064,3888784,12694969,46881409,
 155825289,592435600,1987643889,7408217041,
 25153960000,95823678916,327811212304,
 1227814692624,4234507915264]