A146910 - OEIS

A146910

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0100-1110-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 21, 33, 187, 315, 2369, 4615, 64775, 147707, 4198889, 11294757, 484939233, 1526217059, 94525856839, 346917020079, 34819307110751, 149345046116449, 24639152995360273, 123617463688011623

(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

.0.1.0.0.0.0.0.1.0

.1.1.1.0.0.0.1.1.1

.0.1.1.1.0.1.1.1.0

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.0.1.1.1.0.1.1.1.0

.1.1.1.0.0.0.1.1.1

.0.1.0.0.0.0.0.1.0

CROSSREFS

Sequence in context: A350099 A032792 A146902 * A328862 A167397 A135595

Adjacent sequences: A146907 A146908 A146909 * A146911 A146912 A146913

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved