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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207803 Number of nXn 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 0 1 vertically 1
2, 16, 102, 1970, 57184, 3511534, 388134978, 82999241712, 33304563708790, 25409866877400042, 36648009080479725120, 100161609586888545878490, 518205987191621802807914102, 5077481011895003740693688753360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207808

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207945 A207853 A208022 * A059204 A187248 A236958

Adjacent sequences:  A207800 A207801 A207802 * A207804 A207805 A207806

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 20 2012

STATUS

approved

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

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

Last modified December 21 20:22 EST 2014. Contains 252326 sequences.