A146281 - OEIS

A146281

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 111-110-111 pattern in any orientation.

1, 1, 3, 1, 7, 1, 67, 73, 795, 747, 59843, 10661, 2722871, 192335, 266731999, 104050525, 63050333629, 28433577797, 53230363866129, 6321654487737, 49591407282435513, 2463615767533037, 72391673108224685819

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

OFFSET

1,3

LINKS

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

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

.1.1.1.0.0.1.1.1

.0.0.0.0.0.0.0.0

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A350802 A331884 A146430 * A146265 A146217 A146007

Adjacent sequences: A146278 A146279 A146280 * A146282 A146283 A146284

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved