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!)
A147238 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 5, 21, 51, 289, 1391, 7677, 54075, 500683, 5608015, 82262213, 1433087781 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.1

.0.0.0.0.1.0.1.1

.0.0.0.1.1.0.1.0

.0.0.0.1.0.1.1.1

.1.1.1.0.1.0.0.0

.0.1.0.1.1.0.0.0

.1.1.0.1.0.0.0.0

.1.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A146721 A099979 A039659 * A316435 A339623 A272013

Adjacent sequences: A147235 A147236 A147237 * A147239 A147240 A147241

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 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 February 6 12:03 EST 2023. Contains 360104 sequences. (Running on oeis4.)