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!)
A186931 Number of (n+1) X (n+1) binary arrays with every 2 X 2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock traces. 0
0, 104, 1840, 59720, 3026432, 264604776, 35582947920, 8132915749352, 2989994168957168 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A186939.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for 4 X 4

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

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

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

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

CROSSREFS

Cf. A186939.

Sequence in context: A223420 A250325 A244946 * A273224 A092714 A297977

Adjacent sequences:  A186928 A186929 A186930 * A186932 A186933 A186934

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 01 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 May 16 11:02 EDT 2022. Contains 353700 sequences. (Running on oeis4.)