login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146811 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1000-1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 31, 65, 179, 483, 1549, 5893, 23203, 108809, 513209, 2742185, 15938025, 102500855 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.0.0.0.1.0.1.0.1

.0.0.0.1.0.0.1.1

.1.1.1.0.0.0.0.1

.1.0.0.0.0.1.1.1

.1.1.0.0.1.0.0.0

.1.0.1.0.1.0.0.0

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A178459 A129984 A351707 * A147235 A024876 A146598

Adjacent sequences:  A146808 A146809 A146810 * A146812 A146813 A146814

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 29 04:24 EDT 2022. Contains 357082 sequences. (Running on oeis4.)