A146864 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-1111 pattern in any orientation.

1, 1, 1, 1, 9, 13, 33, 41, 1409, 3235, 90107, 256175, 6239335, 21132187, 2159343451, 9249857635, 1354374350659, 7148183873103, 1813815982643009, 11749437543357083, 7025171720330773661, 56366719637660576905

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.1.0.0.1.1.0
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A032361 A031196 A151725 * A287766 A146739 A146723

Adjacent sequences: A146861 A146862 A146863 * A146865 A146866 A146867

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved