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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147432 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1010-1111-0101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 7, 13, 21, 39, 91, 251, 693, 2197, 6837, 23871, 89603, 379705, 1672695, 8302957, 42265243, 244734851, 1469763313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.1.0.0

.0.0.0.1.0.1.0.1.1

.0.1.1.0.0.0.1.1.0

.1.1.0.0.0.0.0.1.1

.0.1.1.0.0.0.1.1.0

.1.1.0.1.0.1.0.0.0

.0.0.1.1.1.1.0.0.0

.0.0.1.0.1.0.0.0.0

CROSSREFS

Sequence in context: A138035 A032606 A098482 * A018367 A146369 A146377

Adjacent sequences:  A147429 A147430 A147431 * A147433 A147434 A147435

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified December 22 00:23 EST 2014. Contains 252326 sequences.