A146584 - OEIS

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A146584

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 15, 53, 69, 367, 797, 5383, 14177, 132187, 419443, 4770865, 18981007, 272701021, 1381813173, 25671154071, 163453499965

(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

.1.0.0.0.0.1.1.1

.1.0.0.0.1.1.0.0

.1.1.1.0.0.1.0.0

.0.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.0

.0.0.1.0.0.1.1.1

.0.0.1.1.0.0.0.1

.1.1.1.0.0.0.0.1

CROSSREFS

Sequence in context: A373652 A305219 A039314 * A276414 A175033 A043137

Adjacent sequences: A146581 A146582 A146583 * A146585 A146586 A146587

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved