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

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