A146675 - OEIS

A146675

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

1, 1, 1, 1, 5, 1, 23, 13, 524, 295, 16870, 4271, 898998, 126315, 77111883, 11176639, 18132712367, 2597442391, 8818967242020, 846650197340, 7776283446966159, 491920350834891, 12490870356605608844, 626865570839049974

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Maximal 8 X 8 example

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A286897 A167572 A147476 * A201884 A294138 A207824

Adjacent sequences: A146672 A146673 A146674 * A146676 A146677 A146678

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved