cp's OEIS Frontend

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.

A137215 a(n) = 3*(10^n) + (n^2 + 1)*(10^n - 1)/9.

Table of values

n a(n)
0 3
1 32
2 355
3 4110
4 48887
5 588886
6 7111107
7 85555550
8 1022222215
9 12111111102
10 142222222211
11 1655555555542
12 19111111111095
13 218888888888870
14 2488888888888867
15 28111111111111086
16 315555555555555527
17 3522222222222222190
18 39111111111111111075
19 432222222222222222182

List of values

[3, 32, 355, 4110, 48887, 588886, 7111107, 85555550, 1022222215, 12111111102, 142222222211, 1655555555542, 19111111111095, 218888888888870, 2488888888888867, 28111111111111086, 315555555555555527, 3522222222222222190, 39111111111111111075, 432222222222222222182]