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!)
A147183 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 3, 13, 37, 69, 153, 515, 1541, 5473, 24829, 107075, 576645, 3229459, 20010951, 136930705, 1005926097 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.1.0.1.0.1.1.0

.1.1.1.1.0.1.0.0

.1.0.0.0.0.1.1.0

.0.1.1.0.0.0.0.1

.0.0.1.0.1.1.1.1

.0.1.1.0.1.0.1.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A107136 A153009 A147168 * A254955 A098547 A256316

Adjacent sequences:  A147180 A147181 A147182 * A147184 A147185 A147186

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 June 30 22:42 EDT 2022. Contains 354945 sequences. (Running on oeis4.)