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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.

A179190 Coefficient [x^n] of the Maclaurin series for 2 - sqrt(1 - 4*x - 4*x^2).

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 24
5 80
6 288
7 1088
8 4256
9 17088
10 70016
11 291584
12 1230592
13 5251584
14 22623232
15 98248704
16 429677056
17 1890700288
18 8364824576
19 37186449408
20 166030266368
21 744180244480
22 3347321831424
23 15104525959168
24 68357598756864

List of values

[1, 2, 4, 8, 24, 80, 288, 1088, 4256, 17088, 70016, 291584, 1230592, 5251584, 22623232, 98248704, 429677056, 1890700288, 8364824576, 37186449408, 166030266368, 744180244480, 3347321831424, 15104525959168, 68357598756864]

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

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