A146744 - OEIS

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A146744

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1110-1111 pattern in any orientation.

1, 1, 1, 1, 17, 29, 123, 759, 4287, 32985, 430679, 4420973, 81497997, 1458257461, 41635242773

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Maximal 8 X 8 example

.1.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.1

.0.0.0.0.0.0.0.0

.1.1.1.0.1.1.1.1

.1.1.1.1.0.1.1.1

CROSSREFS

Sequence in context: A076727 A347530 A146870 * A103304 A104067 A274023

Adjacent sequences: A146741 A146742 A146743 * A146745 A146746 A146747

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved