A147022 - OEIS

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A147022

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 01000-11111-01000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 13, 31, 111, 377, 1541, 10233, 72291, 558454, 5131417, 54944663, 692190273, 10939712070, 204848963285, 4494698536817, 115494793546585, 3510886748616781, 126280436031316355

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.0.0

.0.0.0.0.1.1.1.0

.0.0.0.1.0.1.0.0

.1.1.1.1.1.0.0.0

.0.0.0.1.0.0.0.0

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146609 A121129 A051402 * A147014 A146376 A146368

Adjacent sequences: A147019 A147020 A147021 * A147023 A147024 A147025

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved