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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A190537 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 diagonally, vertically or horizontally 1
39, 276, 2462, 30347, 497319, 11215564, 345643238, 14729798587, 868126086355, 71051142699591, 8082717906091557, 1279982834102896086, 282345340720841681874, 86807291886729731363231 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A229639 A070146 A327344 * A187095 A232874 A061169

Adjacent sequences:  A190534 A190535 A190536 * A190538 A190539 A190540

KEYWORD

nonn

AUTHOR

R. H. Hardin May 12 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 December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)