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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.

A101563 a(n) = (-1)^n * coefficient of x^n in Sum_{k>=1} x^(k-1)/(1+10*x^k).

Table of values

n a(n)
0 1
1 9
2 101
3 1009
4 10001
5 99909
6 1000001
7 10001009
8 100000101
9 999990009
10 10000000001
11 100000100909
12 1000000000001
13 9999999000009
14 100000000010101
15 1000000010001009
16 10000000000000001
17 99999999900099909

List of values

[1, 9, 101, 1009, 10001, 99909, 1000001, 10001009, 100000101, 999990009, 10000000001, 100000100909, 1000000000001, 9999999000009, 100000000010101, 1000000010001009, 10000000000000001, 99999999900099909]

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

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