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A146825 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 501, 501, 9765, 9765, 253829, 253829, 5201161, 5201161 (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:

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.0.0.0.1.1.1

.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

.1.1.1.0.0.0.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A146604 A294691 A147172 * A147029 A146258 A146173

Adjacent sequences:  A146822 A146823 A146824 * A146826 A146827 A146828

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)