A146411 - OEIS

A146411

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 7, 21, 45, 89, 233, 863, 3251, 15437, 73625, 393971, 2328247, 15894743, 120359659, 1040197243, 9831811849, 105976019467

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

OFFSET

1,7

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.0.1.1.0

.1.0.0.0.1.1.0.0

.1.1.1.1.0.1.0.0

.0.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.0

.0.0.1.0.1.1.1.1

.0.0.1.1.0.0.0.1

.0.1.1.0.0.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved