Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A131180
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A131180 Number of ways of placing non-attacking knights on an n X n chessboard symmetric under 180 degree rotation. +0
1
1, 2, 4, 14, 53, 313, 2170, 31896, 387802, 11507269, 290487893, 15905409672, 816544187208, 90196956861272, 9093799327168995, 2023727669041604444 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A129876 A038055 A006385 this_sequence A047990 A000939 A109154

Adjacent sequences: A131177 A131178 A131179 this_sequence A131181 A131182 A131183

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Aug 25 2008

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

AT&T Labs Research

Legal Notice
© 2007 AT&T Knowledge Ventures. All Rights Reserved.