A146195 - OEIS

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A146195

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 101-111-100 pattern in any orientation.

1, 1, 1, 1, 5, 37, 165, 1001, 4705, 34363, 367959, 6088505, 78978585, 2279840895, 57010330201, 2094575171305, 78104783670439

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.0.1

.0.0.0.0.0.1.1.1

.0.0.1.1.0.0.0.1

.0.0.1.0.1.1.1.0

.0.1.1.1.0.1.0.0

.1.0.0.0.1.1.0.0

.1.1.1.0.0.0.0.0

.1.0.1.0.0.0.0.0

CROSSREFS

Sequence in context: A006468 A144954 A305861 * A358407 A273213 A273275

Adjacent sequences: A146192 A146193 A146194 * A146196 A146197 A146198

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 27 2008

STATUS

approved