The On-Line Encyclopedia of Integer Sequences (OEIS)

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Number of n X n binary arrays symmetric under horizontal and vertical reflection with all 1's connected only in a 2 X 4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.
(history; published version)

#5 by Wesley Ivan Hurt at Mon May 24 15:00:29 EDT 2021

STATUS

editing

approved

#4 by Wesley Ivan Hurt at Mon May 24 15:00:15 EDT 2021

NAME

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones 1's connected only in a 2X4 2 X 4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

STATUS

approved

editing

#3 by Russ Cox at Sat Mar 31 12:35:09 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net), _, Oct 26 2008

Discussion

Sat Mar 31

12:35

OEIS Server: https://oeis.org/edit/global/875

#2 by N. J. A. Sloane at Sat Oct 02 03:00:00 EDT 2010

KEYWORD

nonn,new

nonn

AUTHOR

Ron R. H. Hardin (rhhardin(AT)att.net), Oct 26 2008

#1 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

NAME

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

DATA

1, 1, 1, 1, 1, 1, 1, 1, 29, 29, 249, 249, 4021, 4021, 99935, 99935, 4398251, 4398251, 362789159, 362789159, 47338031953, 47338031953, 10727733486159, 10727733486159

OFFSET

1,9

EXAMPLE

Maximal 9 X 9 example

.1.0.0.1.0.1.0.0.1

.1.1.0.1.0.1.0.1.1

.1.0.1.1.0.1.1.0.1

.1.0.0.1.0.1.0.0.1

.0.0.0.0.0.0.0.0.0

.1.0.0.1.0.1.0.0.1

.1.0.1.1.0.1.1.0.1

.1.1.0.1.0.1.0.1.1

.1.0.0.1.0.1.0.0.1

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Oct 26 2008

STATUS

approved