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!)
A190606 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally, vertically or horizontally 1
39, 240, 2271, 35661, 836514, 27940563, 1374170474, 102369944843, 11464683896495, 1905358977494462, 469934471799881606, 172863979596481949179, 94947989820190085424440 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for 4X4
..0..0..1..1....0..0..1..1....0..0..0..1....0..0..1..0....0..0..1..0
..0..0..1..1....0..1..1..1....0..0..1..0....0..0..1..0....0..0..1..1
..1..1..0..0....1..1..1..1....0..1..0..0....1..1..1..0....1..1..1..1
..1..1..0..0....1..1..1..0....1..0..0..1....0..0..0..1....0..1..1..0
CROSSREFS
Sequence in context: A211503 A266104 A190538 * A101627 A229639 A070146
KEYWORD
nonn
AUTHOR
R. H. Hardin May 13 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 06:44 EDT 2024. Contains 371265 sequences. (Running on oeis4.)