A147132 - OEIS

A147132

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1001-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 21, 513, 983, 10393, 25501, 371965, 1045185, 45350635, 151885957, 15301404559, 63656571009, 10185822253393, 51223616106841, 10431158742897567

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.0.0.0

.0.1.1.0.0.1.1.0

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

CROSSREFS

Sequence in context: A219396 A125613 A147052 * A146840 A146587 A147256

Adjacent sequences: A147129 A147130 A147131 * A147133 A147134 A147135

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved