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.

A071357 Expansion of (1 - 4*x - (1-2*x)*sqrt(1-4*x-4*x^2))/(8*x^3).

Table of values

n a(n)
0 0
1 1
2 4
3 16
4 64
5 260
6 1072
7 4480
8 18944
9 80928
10 348800
11 1515008
12 6625280
13 29147456
14 128918272
15 572928000
16 2557100032
17 11457170944
18 51514963968
19 232370167808
20 1051235287040
21 4768568354816
22 21684663148544
23 98835356778496
24 451433970008064

List of values

[0, 1, 4, 16, 64, 260, 1072, 4480, 18944, 80928, 348800, 1515008, 6625280, 29147456, 128918272, 572928000, 2557100032, 11457170944, 51514963968, 232370167808, 1051235287040, 4768568354816, 21684663148544, 98835356778496, 451433970008064]

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

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