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A146849 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0001 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 53, 53, 349, 349, 3775, 3775, 72823, 72823, 2211763, 2211763, 82363675, 82363675 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.1.0.1.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A147180 A146644 A146612 * A146716 A146399 A146407

Adjacent sequences:  A146846 A146847 A146848 * A146850 A146851 A146852

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified November 27 09:19 EST 2021. Contains 349365 sequences. (Running on oeis4.)