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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147425 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10101-11111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 15, 25, 39, 112, 309, 909, 2627, 8069, 23067, 88292, 336847, 1557719, 7093487, 36776203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 9 X 9 example

.0.0.1.0.1.0.1.0.0

.0.0.1.1.1.1.1.0.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.0.1.1.1.1.1.0.0

.0.0.1.0.1.0.1.0.0

CROSSREFS

Sequence in context: A135342 A029877 A207641 * A080430 A053523 A053522

Adjacent sequences:  A147422 A147423 A147424 * A147426 A147427 A147428

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 | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)