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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147130 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 5, 25, 71, 443, 1859, 9601, 64045, 595391, 5302231, 72852715, 980189123, 19962381129 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.1.1.1.0.0.0.1

.0.1.0.0.1.1.1.1

.0.1.0.0.0.0.0.1

.0.1.0.0.0.0.0.1

.1.0.0.0.0.0.1.0

.1.0.0.0.0.0.1.0

.1.1.1.1.0.0.1.0

.1.0.0.0.1.1.1.1

CROSSREFS

Sequence in context: A146665 A322594 A059302 * A154286 A078234 A056374

Adjacent sequences:  A147127 A147128 A147129 * A147131 A147132 A147133

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 March 25 04:15 EDT 2019. Contains 321457 sequences. (Running on oeis4.)