A146919 - OEIS

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A146919

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 4, 8, 13, 37, 82, 203, 410, 1390, 3260, 13938, 41809, 202082, 670860, 3891211

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.0.0.0

.0.0.1.1.1.1.0.0

.0.1.0.1.1.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.1.1.0.1.0

.0.0.1.1.1.1.0.0

.0.0.0.1.1.0.0.0

CROSSREFS

Sequence in context: A033016 A027008 A114997 * A312221 A312222 A312223

Adjacent sequences: A146916 A146917 A146918 * A146920 A146921 A146922

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved