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A005068 as a simple table

na(n)
10
20
381
40
5625
681
72401
80
981
10625
1114641
1281
1328561
142401
15706
160
1783521
1881
19130321
20625
212482
2214641
23279841
2481
25625
2628561
2781
282401
29707281
30706
31923521
320
3314722
3483521
353026
3681
371874161
38130321
3928642
40625
412825761
422482
433418801
4414641
45706
46279841
474879681
4881
492401
50625
5183602
5228561
537890481
5481

[0,0,81,0,625,81,2401,0,81,625,14641,81,28561,
 2401,706,0,83521,81,130321,625,2482,14641,279841,
 81,625,28561,81,2401,707281,706,923521,0,14722,
 83521,3026,81,1874161,130321,28642,625,2825761,
 2482,3418801,14641,706,279841,4879681,81,2401,625,
 83602,28561,7890481,81]