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A206980 Number of n X n 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal 0

%I

%S 2,16,58,556,7500,119224,2926752,111202694,5582239354,398193149976,

%T 43178426815216,6623459579619334,1414003622686654366,

%U 443957184641073369216

%N Number of n X n 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal

%C Diagonal of A206987

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 14 2012

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Last modified January 26 12:06 EST 2021. Contains 340439 sequences. (Running on oeis4.)