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!)
A146145 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 55, 103, 1119, 2577, 44665, 124149, 7114043, 25427717, 3924887627, 18243132743, 3963931303667, 23264020620581, 10118413718310299, 75049948209301973, 78694111409932613371, 745465591245660563073 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.1.0.0.1.0.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A039596 A013543 A115377 * A044144 A044525 A323070

Adjacent sequences:  A146142 A146143 A146144 * A146146 A146147 A146148

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

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 August 19 16:39 EDT 2022. Contains 356229 sequences. (Running on oeis4.)