A146996 - OEIS

A146996

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 7, 1, 28, 9, 229, 55, 5513, 1233, 246733, 35489, 18835539, 2205048, 2577591714, 236261747, 672360073942, 49798609885, 337403612881491, 18952604466995, 317710878094077132, 13788718527302227

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.0.1.0.0.1.0.0

CROSSREFS

Sequence in context: A053288 A282917 A050301 * A286895 A083994 A301731

Adjacent sequences: A146993 A146994 A146995 * A146997 A146998 A146999

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved