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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.

A179619 a(1)=1, a(n+1) = 10*a(n)+2*n-1.

Table of values

n a(n)
1 1
2 13
3 135
4 1357
5 13579
6 135801
7 1358023
8 13580245
9 135802467
10 1358024689
11 13580246911
12 135802469133
13 1358024691355
14 13580246913577
15 135802469135799
16 1358024691358021
17 13580246913580243
18 135802469135802465
19 1358024691358024687
20 13580246913580246909

List of values

[1, 13, 135, 1357, 13579, 135801, 1358023, 13580245, 135802467, 1358024689, 13580246911, 135802469133, 1358024691355, 13580246913577, 135802469135799, 1358024691358021, 13580246913580243, 135802469135802465, 1358024691358024687, 13580246913580246909]

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

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