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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146010 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation. 0
1, 1, 1, 1, 1, 1, 2, 5, 10, 17, 41, 113, 371, 1287, 4551, 19076, 90597, 483533, 2906704, 18699832, 136658284, 1121369297, 10362476826, 106541327541, 1220122346197, 15486094270737, 222171208299640, 3540873297034591, 63467027877319177 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.0.0.0

.0.0.0.1.1.1.0.0

.0.0.0.1.0.0.1.0

.1.1.1.0.0.0.1.0

.0.1.0.0.0.1.1.1

.0.1.0.0.1.0.0.0

.0.0.1.1.1.0.0.0

.0.0.0.0.1.0.0.0

CROSSREFS

Sequence in context: A173057 A213299 A172114 * A077631 A025223 A177787

Adjacent sequences:  A146007 A146008 A146009 * A146011 A146012 A146013

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 18 17:45 EST 2019. Contains 329287 sequences. (Running on oeis4.)