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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.

A178630 a(n) = 18*((10^n - 1)/9)^2.

Table of values

n a(n)
1 18
2 2178
3 221778
4 22217778
5 2222177778
6 222221777778
7 22222217777778
8 2222222177777778
9 222222221777777778
10 22222222217777777778
11 2222222222177777777778
12 222222222221777777777778
13 22222222222217777777777778
14 2222222222222177777777777778
15 222222222222221777777777777778

List of values

[18, 2178, 221778, 22217778, 2222177778, 222221777778, 22222217777778, 2222222177777778, 222222221777777778, 22222222217777777778, 2222222222177777777778, 222222222221777777777778, 22222222222217777777777778, 2222222222222177777777777778, 222222222222221777777777777778]

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

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