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!)
A147027 Number of n X n binary arrays with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation. 0
1, 1, 1, 9, 33, 81, 593, 11281, 273235, 6759617, 249956567, 17607387437, 1915544919591, 282005360821455 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.0

.1.1.1.1.0.0.1.1

.0.1.0.0.1.1.1.0

.0.1.0.0.0.0.1.0

.0.0.1.0.0.1.0.0

.0.0.1.0.1.1.0.0

.1.1.1.1.0.1.1.1

.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A101990 A147170 A146823 * A146256 A005920 A020324

Adjacent sequences:  A147024 A147025 A147026 * A147028 A147029 A147030

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 4 02:40 EST 2021. Contains 349469 sequences. (Running on oeis4.)