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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A332140 a(n) = 4*(10^(2n+1)-1)/9 - 4*10^n.

Table of values

n a(n)
0 0
1 404
2 44044
3 4440444
4 444404444
5 44444044444
6 4444440444444
7 444444404444444
8 44444444044444444
9 4444444440444444444
10 444444444404444444444
11 44444444444044444444444
12 4444444444440444444444444
13 444444444444404444444444444
14 44444444444444044444444444444
15 4444444444444440444444444444444

List of values

[0, 404, 44044, 4440444, 444404444, 44444044444, 4444440444444, 444444404444444, 44444444044444444, 4444444440444444444, 444444444404444444444, 44444444444044444444444, 4444444444440444444444444, 444444444444404444444444444, 44444444444444044444444444444, 4444444444444440444444444444444]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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