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A317758 Number of nXn 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0

%I

%S 1,6,16,43,109,266,639,1529,3674,8909,21853,54252,136213,345373,

%T 882828,2271143,5871373,15234214,39633091,103306417,269641062,

%U 704462713,1841692605,4816973880,12602801545

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

%C Diagonal of A317764.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317764.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 06 2018

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Last modified November 14 22:32 EST 2019. Contains 329134 sequences. (Running on oeis4.)