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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.

A276990 a(n) = (phi; phi)_n + (1-phi; 1-phi)_n, where (q; q)_n is the q-Pochhammer symbol, phi = (1+sqrt(5))/2 is the golden ratio.

Table of values

n a(n)
0 2
1 1
2 2
3 -2
4 20
5 -190
6 3240
7 -90800
8 4174920
9 -313173840
10 38204662320
11 -7564715117520
12 2428250059593600
13 -1262694691720176000
14 1063187432567808662400
15 -1449125250052431355430400
16 3196769645011428154428883200
17 -11412468527893653264760022630400

List of values

[2, 1, 2, -2, 20, -190, 3240, -90800, 4174920, -313173840, 38204662320, -7564715117520, 2428250059593600, -1262694691720176000, 1063187432567808662400, -1449125250052431355430400, 3196769645011428154428883200, -11412468527893653264760022630400]

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

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