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A146654

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 7, 15, 33, 67, 183, 469, 1433, 5417, 21723, 100185, 477751, 2441485, 14323245, 87372485

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OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.1.0

.0.0.0.0.1.0.0.1

.0.0.0.1.1.0.0.1

.1.0.1.0.0.1.1.1

.1.1.1.0.0.1.0.1

.1.0.0.1.1.0.0.0

.1.0.0.1.0.0.0.0

.0.1.1.1.1.0.0.0

CROSSREFS

Sequence in context: A365527 A079444 A269560 * A363503 A193641 A026701

Adjacent sequences: A146651 A146652 A146653 * A146655 A146656 A146657

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

URL: https://oeis.org/A146654

⇱ A146654 - OEIS