A146801 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 169, 169, 2727, 2727, 71937, 71937, 1640171, 1640171, 45826977, 45826977

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.0.1.0.0.0.1.0.1
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.1.0.1.0.0.0.1.0.1
.1.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A022351 A146873 A146793 * A147203 A146777 A147053

Adjacent sequences: A146798 A146799 A146800 * A146802 A146803 A146804

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved