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A146426 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1010-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 35, 35, 165, 165, 727, 727, 4597, 4597, 49361, 49361 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,11

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 11 X 11 example

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

.1.0.1.0.1.0.1.0.1.0.1

.1.1.1.1.0.0.0.1.1.1.1

.0.0.0.0.0.0.0.0.0.0.0

.1.1.1.1.0.0.0.1.1.1.1

.1.0.1.0.1.0.1.0.1.0.1

.0.0.0.1.1.0.1.1.0.0.0

.0.0.0.0.1.0.1.0.0.0.0

.0.0.0.1.1.0.1.1.0.0.0

CROSSREFS

Sequence in context: A146844 A146193 A146727 * A146051 A146229 A146020

Adjacent sequences:  A146423 A146424 A146425 * A146427 A146428 A146429

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved

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Last modified December 2 17:59 EST 2021. Contains 349445 sequences. (Running on oeis4.)