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.

A015580 Expansion of x/(1 - 9*x - 4*x^2).

Table of values

n a(n)
0 0
1 1
2 9
3 85
4 801
5 7549
6 71145
7 670501
8 6319089
9 59553805
10 561260601
11 5289560629
12 49851088065
13 469818035101
14 4427766668169
15 41729172153925
16 393273616058001
17 3706379233137709
18 34930507562471385
19 329200084994793301
20 3102522795203025249
21 29239505496806400445

List of values

[0, 1, 9, 85, 801, 7549, 71145, 670501, 6319089, 59553805, 561260601, 5289560629, 49851088065, 469818035101, 4427766668169, 41729172153925, 393273616058001, 3706379233137709, 34930507562471385, 329200084994793301, 3102522795203025249, 29239505496806400445]

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

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