A147374 - OEIS

A147374

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 20, 29, 50, 83, 280, 625, 2242, 6281, 30765, 93559, 481174, 1596542, 9219820, 37372099, 265178423, 1263828408, 10782899831

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

OFFSET

1,8

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.1.1.0

.1.1.1.0.0.0.1.1

.1.0.1.0.1.1.1.0

.1.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.1

.0.1.1.1.0.1.0.1

.1.1.0.0.0.1.1.1

.0.1.1.1.0.0.1.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved