A147101 - OEIS

A147101

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 19, 19, 87, 87, 379, 379, 2665, 2665, 39873, 39873, 702997, 702997, 16924511, 16924511, 488669357, 488669357

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.1.0.1.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.1.0.1.0.0.0

CROSSREFS

Sequence in context: A205108 A146032 A147093 * A147141 A146146 A145937

Adjacent sequences: A147098 A147099 A147100 * A147102 A147103 A147104

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved