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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.

A129743 a(n) = -(u^n-1)*(v^n-1) with u = 2+sqrt(3), v = 2-sqrt(3).

Table of values

n a(n)
1 2
2 12
3 50
4 192
5 722
6 2700
7 10082
8 37632
9 140450
10 524172
11 1956242
12 7300800
13 27246962
14 101687052
15 379501250
16 1416317952
17 5285770562
18 19726764300
19 73621286642
20 274758382272
21 1025412242450
22 3826890587532
23 14282150107682
24 53301709843200
25 198924689265122
26 742397047217292

List of values

[2, 12, 50, 192, 722, 2700, 10082, 37632, 140450, 524172, 1956242, 7300800, 27246962, 101687052, 379501250, 1416317952, 5285770562, 19726764300, 73621286642, 274758382272, 1025412242450, 3826890587532, 14282150107682, 53301709843200, 198924689265122, 742397047217292]

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

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