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A146735 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 7, 7, 21, 21, 51, 51, 221, 221, 1241, 1241, 9517 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,13

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 13 X 13 example

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.1.0.0.1.0.0.0.0.0.1.0.0.1

.1.1.1.0.0.0.0.0.0.0.1.1.1

.1.1.0.0.0.0.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.0.0.0.0.1.1

.1.1.1.0.0.0.0.0.0.0.1.1.1

.1.0.0.1.0.0.0.0.0.1.0.0.1

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

CROSSREFS

Sequence in context: A146639 A146703 A146615 * A146711 A146402 A146410

Adjacent sequences:  A146732 A146733 A146734 * A146736 A146737 A146738

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified January 19 06:18 EST 2022. Contains 350464 sequences. (Running on oeis4.)