A146916 - OEIS

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A146916

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

0

1, 1, 1, 3, 1, 5, 9, 25, 65, 311, 777, 5163, 19629, 179101, 938309, 11522939, 83049733, 1385281995, 13583413581, 310426685067, 4145583315227, 129859229238145

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.0.1.1.1.0.1.1.1

.1.1.1.0.1.1.1.0

.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A225855 A201751 A202504 * A146255 A331432 A122366

Adjacent sequences: A146913 A146914 A146915 * A146917 A146918 A146919

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved