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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145790 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either four adjacent vertically or four adjacent horizontally. 0
1, 1, 1, 9, 11, 36, 65, 515, 2420, 18065, 172108, 1981958, 24609296, 431265080, 7420809238, 183434050306, 4983211868325, 173511007323269, 7989094384834315, 376330135051842303, 28830157229045747299, 1923394214566012353119 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..22.

CROSSREFS

Sequence in context: A130730 A153697 A129399 * A143465 A201999 A195309

Adjacent sequences:  A145787 A145788 A145789 * A145791 A145792 A145793

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 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 August 18 15:00 EDT 2019. Contains 326106 sequences. (Running on oeis4.)