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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.

A277091 a(n) = ((1 + sqrt(15))^n - (1 - sqrt(15))^n)/sqrt(15).

Table of values

n a(n)
0 0
1 2
2 4
3 36
4 128
5 760
6 3312
7 17264
8 80896
9 403488
10 1939520
11 9527872
12 46209024
13 225808256
14 1098542848
15 5358401280
16 26096402432
17 127210422784
18 619770479616
19 3020486878208
20 14717760471040
21 71722337236992
22 349493321068544
23 1703099363454976
24 8299105221869568
25 40441601532108800

List of values

[0, 2, 4, 36, 128, 760, 3312, 17264, 80896, 403488, 1939520, 9527872, 46209024, 225808256, 1098542848, 5358401280, 26096402432, 127210422784, 619770479616, 3020486878208, 14717760471040, 71722337236992, 349493321068544, 1703099363454976, 8299105221869568, 40441601532108800]

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

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