A146731 - OEIS

A146731

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 17, 31, 603, 1111, 11835, 31735, 783013, 2381907, 261886119, 1041960181, 168146324241, 823285902521, 171094649806295, 1035545079698547, 471550435880949163, 3533719074119018679

(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

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.1.1

.1.1.1.0.0.1.1.1

.1.0.0.0.0.0.0.1

.0.0.1.0.0.1.0.0

.1.1.1.0.0.1.1.1

.0.1.1.0.0.1.1.0

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A060342 A045700 A146800 * A146667 A146462 A089171

Adjacent sequences: A146728 A146729 A146730 * A146732 A146733 A146734

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved