A146459 - OEIS

A146459

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 19, 53, 91, 437, 1171, 6755, 23673, 190687, 829933, 7917835, 43969469, 541189453, 3877768971, 62027074701, 569529515425

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

OFFSET

1,7

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.0.0.0

.0.0.1.0.1.1.0.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.0.1.1.0.1.0.0

.0.0.0.1.0.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved