A146439 - OEIS

A146439

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 337, 337, 4357, 4357, 135183, 135183, 3521533, 3521533, 135176521, 135176521, 9933992919

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Maximal 9 X 9 example

.0.1.1.1.0.1.1.1.0

.0.1.0.0.0.0.0.1.0

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.0.1.0.0.0.0.0.1.0

.0.1.1.1.0.1.1.1.0

CROSSREFS

Sequence in context: A147133 A147164 A146692 * A146785 A146572 A147211

Adjacent sequences: A146436 A146437 A146438 * A146440 A146441 A146442

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved