A146669 - OEIS

A146669

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 7, 21, 49, 219, 1317, 9715, 80153, 817961, 10735885, 177805125, 3599071193, 90866799531, 2886601451049, 113383289044153, 5503065770566291

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OFFSET

1,6

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

.0.1.0.1.1.0.0.1

.0.1.1.0.0.1.1.1

.1.1.1.0.0.1.1.0

.1.0.0.1.1.0.1.0

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

CROSSREFS

Sequence in context: A137182 A011927 A163723 * A146637 A146701 A146613

Adjacent sequences: A146666 A146667 A146668 * A146670 A146671 A146672

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved