A146797 - OEIS

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A146797

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 15, 37, 67, 105, 399, 1261, 4027, 19513, 89607, 517461, 2695467, 14080529, 92973015, 632822045

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.1

.1.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.0

.1.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.1

.0.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.1

.1.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A369804 A137609 A109818 * A213487 A005491 A348780

Adjacent sequences: A146794 A146795 A146796 * A146798 A146799 A146800

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved