A146467 - OEIS

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A146467

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 5, 23, 45, 89, 241, 909, 3431, 17195, 80847, 474101, 2777977, 19564237, 147127789, 1326666153, 12641403749, 144835493185

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

OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.0.1.1.1.0.0

.1.1.1.0.0.1.0.0

.0.1.0.0.0.0.1.0

.0.0.1.0.0.1.1.1

.0.0.1.1.1.0.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

Sequence in context: A293533 A121308 A222088 * A053518 A154625 A107011

Adjacent sequences: A146464 A146465 A146466 * A146468 A146469 A146470

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved