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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147009 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 6, 13, 20, 35, 74, 191, 479, 1455, 4033, 12735, 40335, 153380, 583871 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.0

.1.1.1.1.1.0.1.0

.0.0.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.0.0

.0.1.0.1.1.1.1.1

.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A101965 A230370 A285246 * A318228 A064290 A064621

Adjacent sequences:  A147006 A147007 A147008 * A147010 A147011 A147012

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 17 12:57 EST 2018. Contains 317276 sequences. (Running on oeis4.)