A146779 - OEIS

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A146779

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0010-1010-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 5, 15, 25, 43, 101, 369, 1113, 5539, 16529, 75239, 298319, 1804759, 9458781, 72980139

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

OFFSET

1,8

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.1.1.1.0.0

.0.0.0.1.0.1.0.0

.1.0.0.1.0.0.1.1

.1.1.1.0.0.0.0.1

.1.0.0.0.0.1.1.1

.1.1.0.0.1.0.0.1

.0.0.1.0.1.0.0.0

.0.0.1.1.1.1.0.0

CROSSREFS

Sequence in context: A003549 A018404 A053928 * A146859 A146835 A146795

Adjacent sequences: A146776 A146777 A146778 * A146780 A146781 A146782

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved