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!)
A147446 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 169, 169, 1097, 1097, 10553, 10553, 189871, 189871, 4385605, 4385605, 121876221 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

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

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.1.1.0.0.0.0.0.1.1.0

.1.1.0.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.1.1.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147149 A147277 A146138 * A146447 A145954 A003874

Adjacent sequences:  A147443 A147444 A147445 * A147447 A147448 A147449

KEYWORD

nonn

AUTHOR

R. H. Hardin

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 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)