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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A191570 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 2 knight-move neighboring 1s 0
2, 8, 64, 608, 8404, 216892, 9337976, 632108017, 67457332362, 11825770678093, 3349770239089324, 1533187995312783695, 1132523827035520870024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A295232 A287229 A323853 * A052707 A059862 A268666

Adjacent sequences:  A191567 A191568 A191569 * A191571 A191572 A191573

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 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 October 16 16:18 EDT 2019. Contains 328101 sequences. (Running on oeis4.)