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!)
A186938 Number of (n+1)X9 binary arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 1
7528, 431656, 5769904, 102475864, 1627815216, 28477050608, 475637108896, 8132915749352, 137957613500896, 2350443973085288, 39973429999524952, 680134904601046536, 11574046354140738136, 196965440910144079296 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A186939

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for 4X9

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

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

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

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

CROSSREFS

Sequence in context: A093225 A090742 A273382 * A185749 A077096 A031137

Adjacent sequences:  A186935 A186936 A186937 * A186939 A186940 A186941

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 26 02:39 EST 2022. Contains 350572 sequences. (Running on oeis4.)