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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.

A294184 a(n) is the number of ways to arrange numbers from 1 to 2*n in a row, starting with 1, such that the sum of every two adjacent numbers is prime, but also considering the ends as adjacent.

Table of values

n a(n)
1 1
2 2
3 2
4 4
5 96
6 1024
7 2880
8 81024
9 770144
10 6309300
11 213812336
12 6395634044
13 165849732426
14 8050337724850
15 255709623233382

List of values

[1, 2, 2, 4, 96, 1024, 2880, 81024, 770144, 6309300, 213812336, 6395634044, 165849732426, 8050337724850, 255709623233382]

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

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