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A091686 as a simple table

n a(n)
0 1
1 8
2 77
3 666
4 5555
5 44444
6 333333
7 2222222
8 11111111
9 0
10 -1111111111
11 -22222222222
12 -333333333333
13 -4444444444444
14 -55555555555555
15 -666666666666666
16 -7777777777777777
17 -88888888888888888
18 -999999999999999999
19 -11111111111111111110
20 -122222222222222222221

[1,8,77,666,5555,44444,333333,2222222,11111111,0,
 -1111111111,-22222222222,-333333333333,
 -4444444444444,-55555555555555,-666666666666666,
 -7777777777777777,-88888888888888888,
 -999999999999999999,-11111111111111111110,
 -122222222222222222221]

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Last modified November 27 19:06 EST 2021. Contains 349394 sequences. (Running on oeis4.)