A146917 Number of n X n binary arrays with all ones connected only in a 0110-1111-0110 pattern in any orientation.

1, 1, 1, 5, 13, 33, 189, 1504, 14808, 192345, 3378235, 83510270, 2816813223, 127717175896, 7956430608952, 672733591665214, 77219550936345236

Offset

1,4

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.1.1.0.0.0.1.0
.1.1.1.1.0.1.1.1
.0.1.1.0.0.1.1.1
.0.0.0.0.0.0.1.0
.0.1.0.0.0.0.0.0
.1.1.1.0.0.1.1.0
.1.1.1.0.1.1.1.1
.0.1.0.0.0.1.1.0

Crossrefs

Sequence in context: A146621 A147086 A032406 * A283329 A201170 A106587

Adjacent sequences: A146914 A146915 A146916 * A146918 A146919 A146920

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved