login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147189 Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01110-00011 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 3, 5, 11, 19, 53, 119, 315, 741, 2791, 8507, 37441, 131241, 690373, 2947311, 17685311, 87080583, 622517947, 3695889011, 31549600531 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.1.1.0

.0.0.0.0.1.1.1.0.1

.0.0.0.1.1.0.0.1.1

.0.0.1.0.0.0.0.1.0

.0.1.1.0.0.0.1.1.0

.0.1.0.0.0.0.1.0.0

.1.1.0.0.1.1.0.0.0

.1.0.1.1.1.0.0.0.0

.0.1.1.0.0.0.0.0.0

CROSSREFS

Sequence in context: A281380 A117272 A243616 * A118744 A092672 A061068

Adjacent sequences:  A147186 A147187 A147188 * A147190 A147191 A147192

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 12 20:45 EDT 2020. Contains 335669 sequences. (Running on oeis4.)