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A091691 as a simple table

n a(n)
0 1
1 0
2 -8
3 -77
4 -666
5 -5555
6 -44444
7 -333333
8 -2222222
9 -11111111
10 0
11 1111111111
12 22222222222
13 333333333333
14 4444444444444
15 55555555555555
16 666666666666666
17 7777777777777777
18 88888888888888888
19 999999999999999999
20 11111111111111111110
21 122222222222222222221

[1,0,-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 October 24 09:09 EDT 2021. Contains 348220 sequences. (Running on oeis4.)