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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146844 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1111-1000 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 85, 85, 391, 391 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

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

EXAMPLE

Maximal 13 X 13 example

.0.0.1.0.0.1.0.1.0.0.1.0.0

.0.0.1.1.1.1.0.1.1.1.1.0.0

.1.1.0.0.0.1.0.1.0.0.0.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.0.0.0.0.1.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.0.0.0.1.0.1.0.0.0.1.1

.0.0.1.1.1.1.0.1.1.1.1.0.0

.0.0.1.0.0.1.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A146261 A146176 A147136 * A146193 A146727 A146426

Adjacent sequences:  A146841 A146842 A146843 * A146845 A146846 A146847

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

EXTENSIONS

Repaired example. - R. H. Hardin, Nov 05 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 30 06:28 EST 2021. Contains 349419 sequences. (Running on oeis4.)