A146145 - OEIS

A146145

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.

1, 1, 1, 1, 1, 1, 55, 103, 1119, 2577, 44665, 124149, 7114043, 25427717, 3924887627, 18243132743, 3963931303667, 23264020620581, 10118413718310299, 75049948209301973, 78694111409932613371, 745465591245660563073

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OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.0.0.0.0.0.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.1.0.1.0.0.1.0.1

.0.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

CROSSREFS

Sequence in context: A039596 A013543 A115377 * A044144 A044525 A323070

Adjacent sequences: A146142 A146143 A146144 * A146146 A146147 A146148

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved