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!)
A147045 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 45, 45, 273, 273, 2925, 2925, 46625, 46625, 908301, 908301, 25944849, 25944849, 1141847565, 1141847565, 74712257377, 74712257377 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
EXAMPLE
Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.1.1.1.0.1.1.1.0
.1.1.0.0.0.0.0.1.1
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.1.1.0.0.0.0.0.1.1
.0.1.1.1.0.1.1.1.0
.0.0.1.0.0.0.1.0.0
CROSSREFS
Sequence in context: A146185 A147399 A147195 * A146065 A146242 A146132
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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 21 06:38 EDT 2024. Contains 373540 sequences. (Running on oeis4.)