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Number of nXn 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0

%I #4 Aug 10 2018 10:28:29

%S 0,1,4,82,6193,1184196,580702029,736219004144,2388442704194600,

%T 19885239768168130210

%N Number of nXn 0..1 arrays with every element unequal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A317896.

%e Some solutions for n=5

%e ..0..1..0..1..0. .0..1..0..1..1. .0..1..1..0..1. .0..1..0..1..0

%e ..1..0..1..1..0. .1..0..0..0..0. .1..0..0..0..1. .1..1..0..0..1

%e ..0..0..1..1..1. .0..1..1..1..0. .1..0..1..0..0. .0..0..0..1..0

%e ..1..0..0..1..0. .1..1..1..1..1. .0..1..1..1..1. .1..0..1..1..0

%e ..0..1..0..0..1. .0..0..0..1..0. .0..1..0..1..0. .1..0..0..0..1

%Y Cf. A317896.

%K nonn

%O 1,3

%A _R. H. Hardin_, Aug 10 2018