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A146039 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation. 0

%I

%S 1,1,1,1,9,13,45,103,3815,10121,444625,1564307,156192449,708716121,

%T 155685558737,926098788583,445436128809681,3444294518750191,

%U 3885959472155218673,39161185591962243237,94947827514803095335545

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.0.0.1

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .1.0.0.0.0.0.0.1

%e .0.0.1.0.0.1.0.0

%e .0.0.1.0.0.1.0.0

%e .0.1.1.0.0.1.1.0

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 26 2008

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Last modified November 30 08:19 EST 2021. Contains 349419 sequences. (Running on oeis4.)