login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A206940 Number of 7Xn 0..1 arrays avoiding 0 0 0 horizontally and 0 1 1 vertically 1
54, 2916, 28081, 783557, 20054092, 348614952, 8138711727, 180107729045, 3670799062946, 80941950903896, 1744792238104043, 37022171557304461, 801688023085812936, 17220005386273509432, 368962831518287162081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A206936

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A003755 A324953 A174445 * A188612 A188605 A188849

Adjacent sequences:  A206937 A206938 A206939 * A206941 A206942 A206943

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2012

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 19 23:59 EDT 2022. Contains 356231 sequences. (Running on oeis4.)