A147446 - OEIS

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A147446

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 169, 169, 1097, 1097, 10553, 10553, 189871, 189871, 4385605, 4385605, 121876221

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

OFFSET

1,11

LINKS

Table of n, a(n) for n=1..25.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.0.0.0.0.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.1.1.0.0.0.0.0.1.1.0

.1.1.0.0.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.0.0.1.1

.0.1.1.0.0.0.0.0.1.1.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147149 A147277 A146138 * A146447 A145954 A003874

Adjacent sequences: A147443 A147444 A147445 * A147447 A147448 A147449

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved