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!)
A146859 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 5, 15, 25, 43, 109, 409, 1219, 6135, 18923, 91055, 376333, 2366771, 12618279, 101741365 (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

.0.0.1.0.1.1.0.0

.0.0.1.1.1.0.0.0

.1.1.0.0.1.0.0.1

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.1.0.0.1.0.0.1.1

.0.0.0.1.1.1.0.0

.0.0.1.1.0.1.0.0

CROSSREFS

Sequence in context: A018404 A053928 A146779 * A146835 A146795 A166479

Adjacent sequences:  A146856 A146857 A146858 * A146860 A146861 A146862

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 28 18:53 EDT 2022. Contains 357081 sequences. (Running on oeis4.)