A147378 - OEIS

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A147378

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 10000-11100-00111-00001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 29, 29, 109, 109, 573, 573, 4463, 4463, 53751, 53751, 903115, 903115, 18601177

(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

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.1.0.0.0.1.0.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.1.0.0.0.0.0.1.0.0

.0.1.1.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.1.1.0

.0.0.1.0.0.0.0.0.1.0.0

.0.0.1.1.0.0.0.1.1.0.0

.0.0.0.1.0.0.0.1.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A111005 A076089 A046000 * A146604 A294691 A356839

Adjacent sequences: A147375 A147376 A147377 * A147379 A147380 A147381

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved