login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A147340 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 57, 57, 341, 341, 3079, 3079, 34841, 34841, 488119, 488119, 8511553 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

.1.1.1.1.0.0.0.1.1.1.1

.0.1.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.0.0.1.0

.1.1.1.1.0.0.0.1.1.1.1

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

CROSSREFS

Sequence in context: A282269 A205380 A246035 * A147499 A146591 A146868

Adjacent sequences:  A147337 A147338 A147339 * A147341 A147342 A147343

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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 16 13:15 EDT 2022. Contains 356168 sequences. (Running on oeis4.)