login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A146387 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 4, 7, 18, 33, 62, 229, 826, 2874, 11455, 45319, 227245, 1250786, 7902554, 51293369, 381222454, 3041924174, 28668489843, 286940122325, 3336283386716 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.0.1.1.0.0.0

.1.0.0.0.0.0.0.1

.1.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.0.0.1.1.0.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A056318 A011948 A256216 * A219498 A219754 A124400

Adjacent sequences:  A146384 A146385 A146386 * A146388 A146389 A146390

KEYWORD

nonn

AUTHOR

R. H. Hardin

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 11 06:55 EST 2016. Contains 279043 sequences.