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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.

A332149 a(n) = 4*(10^(2*n+1)-1)/9 + 5*10^n.

Table of values

n a(n)
0 9
1 494
2 44944
3 4449444
4 444494444
5 44444944444
6 4444449444444
7 444444494444444
8 44444444944444444
9 4444444449444444444
10 444444444494444444444
11 44444444444944444444444
12 4444444444449444444444444
13 444444444444494444444444444
14 44444444444444944444444444444
15 4444444444444449444444444444444

List of values

[9, 494, 44944, 4449444, 444494444, 44444944444, 4444449444444, 444444494444444, 44444444944444444, 4444444449444444444, 444444444494444444444, 44444444444944444444444, 4444444444449444444444444, 444444444444494444444444444, 44444444444444944444444444444, 4444444444444449444444444444444]

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

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