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!)
A207723 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 0 1 vertically 1
2, 16, 78, 441, 8575, 277729, 4799749, 93547584, 8978585264, 1701743731081, 92421758243781, 5198831216732241, 3314060538084914409, 4426079717506620317769, 675694617961142291654422 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207729

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A028336 A244717 A208102 * A208835 A208683 A197992

Adjacent sequences:  A207720 A207721 A207722 * A207724 A207725 A207726

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 19 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 29 06:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)