A146421 - OEIS

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A146421

Number of n X n binary arrays with all ones connected only in a 1010-1111 pattern in any orientation.

1, 1, 1, 29, 229, 1773, 39925, 1086663, 55544427, 4442151653, 513575103485

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

OFFSET

1,4

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.0.0.1.1

.1.0.1.1.0.0.0.1

.1.1.0.1.0.0.1.1

.1.0.1.1.0.0.0.1

.0.1.0.0.1.0.1.0

.1.1.0.1.1.0.1.1

.0.1.0.0.1.0.1.0

.1.1.0.1.1.0.1.1

CROSSREFS

Sequence in context: A142066 A091631 A244767 * A093401 A228408 A042636

Adjacent sequences: A146418 A146419 A146420 * A146422 A146423 A146424

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved