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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.

A173148 a(n) = cos(2*n*arccos(sqrt(n))).

Table of values

n a(n)
0 1
1 1
2 17
3 485
4 18817
5 930249
6 55989361
7 3974443213
8 325142092801
9 30122754096401
10 3117419602578001
11 356452534779818421
12 44627167107085622401
13 6071840759403431812825
14 892064955046043465408177
15 140751338790698080509966749
16 23737154316161495960243527681

List of values

[1, 1, 17, 485, 18817, 930249, 55989361, 3974443213, 325142092801, 30122754096401, 3117419602578001, 356452534779818421, 44627167107085622401, 6071840759403431812825, 892064955046043465408177, 140751338790698080509966749, 23737154316161495960243527681]

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

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