login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A190655 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its diagonal and antidiagonal neighbors 1
1, 2, 4, 24, 224, 2862, 53010, 1527552, 65195940, 4097065492, 385902826186, 54089022594864, 11269850153217786, 3491854976674289164, 1609153719436211880868, 1102542409006001885651456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for n=5 with a(1,1)=0

..0..1..1..0..1....0..1..0..0..1....0..1..0..1..1....0..1..0..0..1

..1..0..0..1..1....1..0..1..1..0....1..0..1..1..0....1..0..1..1..0

..1..0..0..1..0....0..1..1..0..0....0..1..1..0..0....0..1..0..0..1

..0..1..1..0..0....0..1..0..0..1....1..1..0..0..1....0..1..0..0..0

..1..1..0..0..0....1..0..0..1..0....1..0..0..1..0....1..0..1..0..0

CROSSREFS

Sequence in context: A121892 A032107 A141307 * A038049 A151817 A265937

Adjacent sequences:  A190652 A190653 A190654 * A190656 A190657 A190658

KEYWORD

nonn

AUTHOR

R. H. Hardin May 16 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 21 06:42 EDT 2019. Contains 322310 sequences. (Running on oeis4.)