login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147396 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 13, 45, 145, 549, 1997, 9119, 41645 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.0.0.0.1.0.0

.0.0.0.0.0.1.0.0

.0.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.0

.0.0.1.0.0.0.0.0

.0.0.1.0.0.0.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

Sequence in context: A322203 A052899 A147200 * A320877 A099972 A060050

Adjacent sequences:  A147393 A147394 A147395 * A147397 A147398 A147399

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 17 05:36 EDT 2021. Contains 343059 sequences. (Running on oeis4.)