A146800 - OEIS

A146800

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 31, 559, 1013, 8291, 23145, 356907, 1013595, 108749189, 407493401, 61299279691, 281660353619, 43848445982931, 246087198399431, 73605493456575165, 501006153269757647

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

OFFSET

1,7

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.1.0.0

.1.0.1.0.0.1.0.1

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.1.0.0.0.0.0.0.1

.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: A027722 A060342 A045700 * A146731 A146667 A146462

Adjacent sequences: A146797 A146798 A146799 * A146801 A146802 A146803

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved