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A147456

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 11000-01111-11000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 6, 11, 18, 27, 52, 137, 404, 1237, 3559, 10401, 31124, 115055, 457260, 2084424, 9632056

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OFFSET

1,10

LINKS

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

EXAMPLE

Maximal 10 X 10 example

.0.0.0.0.0.1.1.0.0.0

.0.0.1.1.1.1.0.0.0.0

.0.1.0.0.0.1.1.0.0.0

.0.1.0.0.0.0.0.1.0.1

.0.1.0.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.0.1.0

.1.0.1.0.0.0.0.0.1.0

.0.0.0.1.1.0.0.0.1.0

.0.0.0.0.1.1.1.1.0.0

.0.0.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A172046 A014125 A393313 * A230088 A011849 A350104

Adjacent sequences: A147453 A147454 A147455 * A147457 A147458 A147459

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

URL: https://oeis.org/A147456

⇱ A147456 - OEIS