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A016946 as a simple table

na(n)
09
181
2225
3441
4729
51089
61521
72025
82601
93249
103969
114761
125625
136561
147569
158649
169801
1711025
1812321
1913689
2015129
2116641
2218225
2319881
2421609
2523409
2625281
2727225
2829241
2931329
3033489
3135721
3238025
3340401
3442849
3545369
3647961
3750625
3853361
3956169

[9,81,225,441,729,1089,1521,2025,2601,3249,3969,
 4761,5625,6561,7569,8649,9801,11025,12321,13689,
 15129,16641,18225,19881,21609,23409,25281,27225,
 29241,31329,33489,35721,38025,40401,42849,45369,
 47961,50625,53361,56169]