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A146065 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 53, 53, 497, 497, 10289, 10289, 196357, 196357, 5677027, 5677027, 310742317, 310742317, 27512226687, 27512226687, 3369038880519, 3369038880519, 646981592661815, 646981592661815 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.1

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A147399 A147195 A147045 * A146242 A146132 A282982

Adjacent sequences: A146062 A146063 A146064 * A146066 A146067 A146068

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified February 1 08:20 EST 2023. Contains 359992 sequences. (Running on oeis4.)