The On-Line Encyclopedia of Integer Sequences (OEIS)

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A147373

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.
(history; published version)

#4 by Russ Cox at Sat Mar 31 12:35:16 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net)_

Discussion

Sat Mar 31

12:35

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

#3 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)

#2 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

NAME

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orentationorientation.

KEYWORD

nonn,new

nonn

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

NAME

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orentation.

DATA

1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 8, 3, 22, 9, 79, 19, 256, 42, 946, 149, 4545, 642, 27699, 3217

OFFSET

1,9

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.0.1.1.1.0.0.0

.1.1.1.0.1.0.1.1.1

.0.0.1.1.0.1.1.0.0

.1.1.1.0.1.0.1.1.1

.0.0.0.1.1.1.0.0.0

.0.0.0.1.0.1.0.0.0

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net)

STATUS

approved