cp's OEIS Frontend

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.

A287405 a(n) = (7*(cot(1*Pi/7))^2)^n + (7*(cot(2*Pi/7))^2)^n + (7*(cot(4*Pi/7))^2)^n.

Table of values

n a(n)
0 3
1 35
2 931
3 27587
4 830403
5 25054435
6 756187747
7 22824258947
8 688917131651
9 20793986742179
10 627637106311971
11 18944339609269571
12 571808137046942019
13 17259221092289630307
14 520945214725090792931
15 15723995613526902256387
16 474606601742375424297731

List of values

[3, 35, 931, 27587, 830403, 25054435, 756187747, 22824258947, 688917131651, 20793986742179, 627637106311971, 18944339609269571, 571808137046942019, 17259221092289630307, 520945214725090792931, 15723995613526902256387, 474606601742375424297731]

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

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