A146933 Number of n X n binary arrays with all ones connected only in a 1111-1111 pattern in any orientation.

1, 1, 1, 7, 25, 89, 559, 4332, 47525, 720844, 13515353, 345530332, 11945906159, 546900316419, 33704239869671, 2765958377374818

Offset

1,4

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.1.1.1.1.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1
.1.1.0.1.1.0.1.1

Crossrefs

Sequence in context: A183914 A279216 A245769 * A155258 A261722 A256370

Adjacent sequences: A146930 A146931 A146932 * A146934 A146935 A146936

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved