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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147403 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 25, 37, 81, 207, 659, 1525, 5011, 16955, 78955, 307577, 1539617, 6559267, 39653567, 197073411, 1351045655 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.1.0.0.0

.0.0.0.1.0.1.1.0.0

.0.1.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.0

.1.0.0.0.0.0.0.0.1

.0.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.1.0

.0.0.1.1.0.1.0.0.0

.0.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A044070 A226647 A147199 * A241764 A044451 A114057

Adjacent sequences:  A147400 A147401 A147402 * A147404 A147405 A147406

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 26 08:05 EDT 2019. Contains 322472 sequences. (Running on oeis4.)