A147025 - OEIS

A147025

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01000-11111-01000 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 15, 21, 45, 77, 273, 569, 2606, 6661, 31883, 89951, 535540, 1839325, 13532589, 55467031, 467306429, 2229430591, 22257836225

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

OFFSET

1,8

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.0.0.1.0

.1.1.1.1.1.0.1.0

.0.0.0.1.0.0.1.0

.0.1.0.0.0.1.1.1

.1.1.1.0.0.0.1.0

.0.1.0.0.1.0.0.0

.0.1.0.1.1.1.1.1

.0.1.0.0.1.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved