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A145953 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation. 0

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,7,11,159,327,5133,13861,849385,3108015,457381857,2235253839,

%T 607242639437,3907846853149,2764340116761305,23642760363071615,

%U 40211844595990066697,457112748895519083981,1725707575657931227023395

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

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .0.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.0.0.1

%e .0.1.1.0.0.1.1.0

%e .1.1.0.0.0.0.1.1

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 25 2008

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Last modified April 19 07:26 EDT 2024. Contains 371782 sequences. (Running on oeis4.)