A146038 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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