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.

A185645 Number of permutations q_1,...,q_n of the first n primes p_1,...,p_n with q_1 = p_1 = 2 and q_n = p_n, and with |q_1-q_2|, |q_2-q_3|, ..., |q_{n-1}-q_n|, and |q_n-q_1| (if n>2) pairwise distinct.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 3
6 5
7 10
8 33
9 153
10 1060
11 7337
12 51434
13 440728
14 3587067
15 28498105
16 271208386
17 3014400869
18 35358507494

List of values

[1, 1, 1, 1, 3, 5, 10, 33, 153, 1060, 7337, 51434, 440728, 3587067, 28498105, 271208386, 3014400869, 35358507494]

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

Content is available under The OEIS End-User License Agreement.