The On-Line Encyclopedia of Integer Sequences (OEIS)

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A147034

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
(history; published version)

#4 by Russ Cox at Sat Mar 31 12:35:14 EDT 2012

AUTHOR

_R. H. Hardin (rhhardin(AT)att.net), _, Nov 04 2008

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), Nov 04 2008

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

NAME

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111-0010 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 under 180 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orentation.

DATA

1, 1, 1, 1, 1, 5, 25, 85, 499, 2253, 9751, 103141, 1030207, 12930523, 188986765, 3964919203, 79856104275, 2515127447393

OFFSET

1,6

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.0.1.1.1.0.0.1.0

.1.1.0.0.1.1.1.1

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.1.1.1.1.0.0.1.1

.0.1.0.0.1.1.1.0

.0.1.0.0.0.0.1.0

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

STATUS

approved