A147020 - OEIS

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A147020

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-01000 pattern in any orientation.

1, 1, 1, 1, 3, 1, 15, 9, 133, 33, 3625, 1063, 187163, 37071, 15421524, 1848587, 2304715815, 239808955, 763574051396, 59268926793, 494418074953389, 27771432799839

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

OFFSET

1,5

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A318392 A329059 A147453 * A134685 A130757 A181996

Adjacent sequences: A147017 A147018 A147019 * A147021 A147022 A147023

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved