A146038 Number of n X n binary arrays with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

1, 1, 1, 29, 249, 4021, 99935, 4398251, 362789159, 47338031953, 10727733486159, 4071858369077715

Offset

1,4

Links

Table of n, a(n) for n=1..12.

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.1.0
.0.1.0.0.0.0.1.0
.0.0.1.0.1.0.1.1
.0.1.1.0.1.0.1.0
.1.0.1.0.1.1.0.1
.1.0.1.0.1.0.0.1
.1.1.0.1.0.0.1.1
.1.0.1.1.1.1.0.1

Crossrefs

Sequence in context: A334690 A027939 A146127 * A142683 A042634 A223769

Adjacent sequences: A146035 A146036 A146037 * A146039 A146040 A146041

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved