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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.

A215500 a(n) = ((sqrt(5) + 3)^n + (-sqrt(5) -1)^n + (-sqrt(5) + 3)^n + (sqrt(5) - 1)^n) / 2^n.

Table of values

n a(n)
0 4
1 2
2 10
3 14
4 54
5 112
6 340
7 814
8 2254
9 5702
10 15250
11 39404
12 104004
13 270922
14 711490
15 1859134
16 4873054
17 12748472
18 33391060
19 87394454
20 228841254
21 599050102
22 1568437210
23 4106054164
24 10750060804
25 28143585362
26 73681573690
27 192899714414
28 505019869254
29 1322156172352

List of values

[4, 2, 10, 14, 54, 112, 340, 814, 2254, 5702, 15250, 39404, 104004, 270922, 711490, 1859134, 4873054, 12748472, 33391060, 87394454, 228841254, 599050102, 1568437210, 4106054164, 10750060804, 28143585362, 73681573690, 192899714414, 505019869254, 1322156172352]

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

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