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.

A067360 a(n) = 17^n sin(2n arctan(1/4)) or numerator of tan(2n arctan(1/4)).

Table of values

n a(n)
1 8
2 240
3 4888
4 77280
5 905768
6 4839120
7 -116593352
8 -4896306240
9 -113193708472
10 -1980778750800
11 -26710380775592
12 -228866364286560
13 853309115549288
14 91741652745294480
15 2505643247965090168
16 48655959795562600320
17 735547895204966951048

List of values

[8, 240, 4888, 77280, 905768, 4839120, -116593352, -4896306240, -113193708472, -1980778750800, -26710380775592, -228866364286560, 853309115549288, 91741652745294480, 2505643247965090168, 48655959795562600320, 735547895204966951048]

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

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