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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.

A100284 Expansion of (1-4*x-x^2)/((1-x)*(1-4*x-5*x^2)).

Table of values

n a(n)
0 1
1 1
2 5
3 21
4 105
5 521
6 2605
7 13021
8 65105
9 325521
10 1627605
11 8138021
12 40690105
13 203450521
14 1017252605
15 5086263021
16 25431315105
17 127156575521
18 635782877605
19 3178914388021
20 15894571940105
21 79472859700521
22 397364298502605

List of values

[1, 1, 5, 21, 105, 521, 2605, 13021, 65105, 325521, 1627605, 8138021, 40690105, 203450521, 1017252605, 5086263021, 25431315105, 127156575521, 635782877605, 3178914388021, 15894571940105, 79472859700521, 397364298502605]

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

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