A147233 - OEIS

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A147233

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 65, 65, 377, 377, 4203, 4203, 88657, 88657, 2446623, 2446623, 84129749, 84129749

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

OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.0.0.0.1.1.1

.1.0.1.1.0.1.1.0.1

.0.0.0.0.0.0.0.0.0

.1.0.1.1.0.1.1.0.1

.1.1.1.0.0.0.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146455 A146048 A146809 * A146817 A146660 A070852

Adjacent sequences: A147230 A147231 A147232 * A147234 A147235 A147236

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved