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A145945 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected in a 3X2 elbow 1,1 1,2 1,3 2,3 in any orientation. 0
1, 1, 1, 1, 1, 1, 17, 17, 101, 101, 1439, 1439, 45325, 45325, 2541179, 2541179, 249765423, 249765423, 48546882545, 48546882545, 17503645590565, 17503645590565 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

LINKS

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

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

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A070852 A146596 A146391 * A165838 A217543 A296757

Adjacent sequences:  A145942 A145943 A145944 * A145946 A145947 A145948

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 25 2008

STATUS

approved

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Last modified October 23 11:52 EDT 2021. Contains 348212 sequences. (Running on oeis4.)