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!)
A146697 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1100-0111 pattern in any orientation. 0
1, 1, 1, 1, 5, 17, 57, 245, 1399, 8039, 58749, 512869, 6687103, 97819251, 1920614851, 41357859019 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.0.0.0

.1.1.1.0.0.0.1.1

.1.0.0.0.0.0.1.1

.1.0.0.0.1.1.1.0

.0.1.1.1.0.0.0.1

.1.1.0.0.0.0.0.1

.1.1.0.0.0.1.1.1

.0.0.0.0.0.1.1.0

CROSSREFS

Sequence in context: A098184 A289590 A054113 * A009229 A010914 A180502

Adjacent sequences:  A146694 A146695 A146696 * A146698 A146699 A146700

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 December 8 00:04 EST 2021. Contains 349590 sequences. (Running on oeis4.)