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Number of nXn 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0

%I #4 Aug 21 2018 13:09:38

%S 0,3,4,69,1042,28010,1122773,93034400,12949799902,3077725091253

%N Number of nXn 0..1 arrays with every element unequal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Diagonal of A318214.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A318214.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 21 2018