login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A192258 Number of n X n symmetric binary matrices with each element either the sum mod 2 of its horizontal neighbors or the sum mod 2 of its vertical neighbors 1
1, 2, 3, 10, 52, 305, 3336, 53160, 1210187, 43234473, 2296063392, 180971357507, 21523051916415, 3822241812458992, 1013512678870403979, 402404564958432626790, 238779216876700299752228 (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 5X5

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

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

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

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

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

CROSSREFS

Sequence in context: A020098 A013081 A054921 * A052561 A181927 A066526

Adjacent sequences:  A192255 A192256 A192257 * A192259 A192260 A192261

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 26 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 2 19:05 EDT 2020. Contains 333190 sequences. (Running on oeis4.)