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.

A151581 Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.

Table of values

n a(n)
8 0
9 9
10 5020
11 526240
12 26441856
13 862140162
14 21078701112
15 419567641380
16 7160621079552
17 108507581733075
18 1496470017336660
19 19127489390389332
20 229712892700188480
21 2619711824193741060
22 28608047711740408560
23 301155410573256748920
24 3072652643940279427584

List of values

[0, 9, 5020, 526240, 26441856, 862140162, 21078701112, 419567641380, 7160621079552, 108507581733075, 1496470017336660, 19127489390389332, 229712892700188480, 2619711824193741060, 28608047711740408560, 301155410573256748920, 3072652643940279427584]

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

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