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.

A122749 Number of arrangements of n non-attacking bishops on an n X n board such that every square of the board is controlled by at least one bishop.

Table of values

n a(n)
2 4
3 2
4 16
5 44
6 256
7 768
8 5184
9 25344
10 186624
11 996480
12 8294400
13 57888000
14 530841600
15 4006195200
16 40642560000
17 367408742400
18 4064256000000
19 39358255104000
20 474054819840000
21 5254107586560000
22 68263894056960000
23 804207665479680000
24 11242684107325440000

List of values

[4, 2, 16, 44, 256, 768, 5184, 25344, 186624, 996480, 8294400, 57888000, 530841600, 4006195200, 40642560000, 367408742400, 4064256000000, 39358255104000, 474054819840000, 5254107586560000, 68263894056960000, 804207665479680000, 11242684107325440000]

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

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