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A002281 as a simple table

n a(n)
0 0
1 7
2 77
3 777
4 7777
5 77777
6 777777
7 7777777
8 77777777
9 777777777
10 7777777777
11 77777777777
12 777777777777
13 7777777777777
14 77777777777777
15 777777777777777
16 7777777777777777
17 77777777777777777
18 777777777777777777
19 7777777777777777777

[0,7,77,777,7777,77777,777777,7777777,77777777,
 777777777,7777777777,77777777777,777777777777,
 7777777777777,77777777777777,777777777777777,
 7777777777777777,77777777777777777,
 777777777777777777,7777777777777777777]

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Last modified May 29 20:42 EDT 2020. Contains 334710 sequences. (Running on oeis4.)