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A053961 as a simple table

n a(n)
1 4
2 9
3 49
4 64
5 44944
6 69696
7 4999696
8 9696996
9 9966649
10 999444996
11 4649466969
12 64944444964
13 6469646694964996
14 69446644696999969
15 9446966946446994496
16 44499464666496696649
17 446646664496496964644
18 466994666666446696996
19 494494499966694999949669969

[4,9,49,64,44944,69696,4999696,9696996,9966649,
 999444996,4649466969,64944444964,6469646694964996,
 69446644696999969,9446966946446994496,
 44499464666496696649,446646664496496964644,
 466994666666446696996,494494499966694999949669969]

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Last modified May 27 13:00 EDT 2020. Contains 334657 sequences. (Running on oeis4.)