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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.

A147961 a(n) = ((6+sqrt(3))^n + (6-sqrt(3))^n)/2.

Table of values

n a(n)
0 1
1 6
2 39
3 270
4 1953
5 14526
6 109863
7 838998
8 6442497
9 49623030
10 382873959
11 2956927518
12 22848289569
13 176600866734
14 1365216845031
15 10554773538150
16 81605126571777
17 630953992102374
18 4878478728359847
19 37720263000939822
20 291653357975402913
21 2255071616673820830
22 17436298586897553831

List of values

[1, 6, 39, 270, 1953, 14526, 109863, 838998, 6442497, 49623030, 382873959, 2956927518, 22848289569, 176600866734, 1365216845031, 10554773538150, 81605126571777, 630953992102374, 4878478728359847, 37720263000939822, 291653357975402913, 2255071616673820830, 17436298586897553831]

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

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