A147092 - OEIS

A147092

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 59, 101, 919, 1809, 23303, 53143, 671599, 1750531, 39110451, 115146065, 6975569265, 24305619481, 1970620781315, 8024744347051, 1076617600931991, 5122974578707761

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

OFFSET

1,9

LINKS

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

EXAMPLE

Maximal 9 X 9 example

.1.1.1.1.0.1.1.1.1

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

.1.0.0.0.0.0.0.0.1

.1.1.1.1.0.1.1.1.1

CROSSREFS

Sequence in context: A199977 A134573 A106869 * A142298 A231978 A180947

Adjacent sequences: A147089 A147090 A147091 * A147093 A147094 A147095

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved