login
The OEIS is supported by the many generous donors to the OEIS 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 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146600 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 19, 39, 83, 233, 711, 2313, 8511, 40097, 191977, 1081845, 6288993, 41547129, 292524045, 2387601825, 20697818111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.1.1.1

.1.0.0.0.0.1.0.0

.1.1.1.1.0.1.0.0

.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0

.0.0.1.0.1.1.1.1

.0.0.1.0.0.0.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A254060 A129828 A239831 * A262997 A031379 A125202

Adjacent sequences: A146597 A146598 A146599 * A146601 A146602 A146603

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 November 29 13:13 EST 2022. Contains 358429 sequences. (Running on oeis4.)