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A018885 as a simple table

na(n)
10
21
34
49
516
625
736
849
964
1081
11100
12121
13144
14225
15400
16441
17484
18676
19900
201444
217744
2210000
2311881
2429929
2540000
2644944
2755225
2869696
2990000
301000000
314000000
329000000
339696996
34100000000
35400000000
36900000000
376661661161
3810000000000

[0,1,4,9,16,25,36,49,64,81,100,121,144,225,400,
 441,484,676,900,1444,7744,10000,11881,29929,40000,
 44944,55225,69696,90000,1000000,4000000,9000000,
 9696996,100000000,400000000,900000000,6661661161,
 10000000000]