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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.

A278417 a(n) = n*((2+sqrt(3))^n + (2-sqrt(3))^n)/2.

Table of values

n a(n)
0 0
1 2
2 14
3 78
4 388
5 1810
6 8106
7 35294
8 150536
9 632034
10 2620870
11 10759342
12 43804812
13 177105266
14 711809378
15 2846259390
16 11330543632
17 44929049794
18 177540878718
19 699402223118
20 2747583822740
21 10766828545746
22 42095796462874
23 164244726238366
24 639620518118424
25 2486558615814050
26 9651161613824822
27 37403957244654702

List of values

[0, 2, 14, 78, 388, 1810, 8106, 35294, 150536, 632034, 2620870, 10759342, 43804812, 177105266, 711809378, 2846259390, 11330543632, 44929049794, 177540878718, 699402223118, 2747583822740, 10766828545746, 42095796462874, 164244726238366, 639620518118424, 2486558615814050, 9651161613824822, 37403957244654702]

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

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