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A203828 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 0

%I

%S 45,1971,270333,119606211,173185290765,827309554361235,

%T 13102412661293146461,690154670186627261773347

%N Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

%C Diagonal of A203835

%e Some solutions for n=4

%e ..2..2..1..2..2....2..1..0..2..1....0..1..2..2..0....0..0..0..1..2

%e ..2..1..2..1..2....2..2..1..0..2....0..0..1..2..2....1..0..2..0..1

%e ..1..2..1..1..1....1..2..2..1..0....2..0..0..1..2....2..1..0..0..0

%e ..1..1..0..1..2....0..1..2..2..1....0..2..0..0..1....2..2..1..0..0

%e ..1..2..1..1..1....0..0..1..2..2....0..0..2..0..0....1..2..2..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 06 2012

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Last modified July 12 06:21 EDT 2020. Contains 335658 sequences. (Running on oeis4.)