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A068187 as a simple table

n a(n)
1 1
2 4
3 39
4 488
5 55555
6 88999
7 7777777
8 88888888
9 999999999
10 25555555555888
11 0
12 88888888999999
13 0
14 4777777777777778888
15 35555555555555559999999
16 2888888888888888888888
17 0
18 888888999999999999999999
19 0
20 2555555555555555555558888888888888
21 37777777777777777777779999999999

[1,4,39,488,55555,88999,7777777,88888888,
 999999999,25555555555888,0,88888888999999,0,
 4777777777777778888,35555555555555559999999,
 2888888888888888888888,0,888888999999999999999999,
 0,2555555555555555555558888888888888,
 37777777777777777777779999999999]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)