login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147074 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10000-11111-00001 pattern in any orientation. 0
1, 1, 1, 1, 5, 9, 25, 39, 151, 463, 2967, 12351, 101811, 497317, 5967627, 41101207, 709472803 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.0.0.0.0

.0.1.0.1.1.1.1.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.1.1.0

.0.1.1.0.0.0.1.0

.1.0.0.0.0.0.1.0

.1.1.1.1.1.0.1.0

.0.0.0.0.1.0.1.1

CROSSREFS

Sequence in context: A269918 A273827 A024825 * A147192 A259665 A284285

Adjacent sequences:  A147071 A147072 A147073 * A147075 A147076 A147077

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 14 07:07 EST 2019. Contains 329110 sequences. (Running on oeis4.)