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!)
A145944 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation. 0
1, 1, 1, 1, 13, 19, 595, 1473, 41647, 139371, 13954303, 64086157, 18839470495, 119460750005, 78516712094765, 679135834059151, 1132864641733411477, 13390989972487068017, 60598468634533341708705, 981938713996881194950713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.1.1.0.0.1.1.0

.1.0.1.0.0.1.0.1

.1.0.1.0.0.1.0.1

.1.1.0.0.0.0.1.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A088187 A146047 A343034 * A330425 A335971 A176150

Adjacent sequences:  A145941 A145942 A145943 * A145945 A145946 A145947

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 26 02:14 EDT 2021. Contains 348256 sequences. (Running on oeis4.)