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A146064 Number of n X n binary arrays symmetric under horizontal 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, 49, 91, 755, 1733, 17237, 43939, 2178205, 7075949, 921596877, 3869156215, 535678119399, 2790029976011, 707504525942961, 4543722915142743, 2950922408069540377, 23782316720866894839, 30573780517964151258947 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.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

.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: A020158 A084632 A020176 * A224905 A224846 A260469

Adjacent sequences: A146061 A146062 A146063 * A146065 A146066 A146067

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified February 1 07:16 EST 2023. Contains 359981 sequences. (Running on oeis4.)