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!)
A146826 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 3, 11, 27, 69, 315, 1713, 11493, 84155, 723421, 7696049, 106846827, 1733858135, 33633104443, 799782972413, 23215563898915, 806581387639407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.1

.0.0.0.0.1.1.1.1

.0.0.0.1.0.0.1.0

.0.0.0.1.0.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A147110 A147118 A147157 * A059400 A250223 A250271

Adjacent sequences:  A146823 A146824 A146825 * A146827 A146828 A146829

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 July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)