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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146433 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 101-111-101 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 9, 13, 25, 49, 124, 263, 846, 2209, 7594, 21663, 81736, 275021, 1243671, 4831201, 26082779, 118314435, 731456697, 3805948133, 26532655113, 159482402665 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A144933 A133033 A145365 * A134672 A211389 A082874

Adjacent sequences:  A146430 A146431 A146432 * A146434 A146435 A146436

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 October 21 09:39 EDT 2014. Contains 248377 sequences.