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A030987 as a simple table

n a(n)
1 4
2 44
3 344
4 7344
5 77344
6 777344
7 6777344
8 46777344
9 446777344
10 446777344
11 20446777344
12 20446777344
13 5020446777344
14 35020446777344
15 935020446777344
16 5935020446777344
17 35935020446777344 

[4,44,344,7344,77344,777344,6777344,46777344,
 446777344,446777344,20446777344,20446777344,
 5020446777344,35020446777344,935020446777344,
 5935020446777344,35935020446777344]

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Last modified April 24 03:00 EDT 2024. Contains 371917 sequences. (Running on oeis4.)