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A184367 1/3 the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically 0

%I

%S 21,2755,2167173,10378244309,301753233626727,53293289955084658949,

%T 57168347029530545962203193,372482322079037724494019844619359

%N 1/3 the number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having at least two equal elements connected horizontally or vertically

%C Diagonal of A184376

%e Some solutions for 3X3 with a(1,1)=0

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 12 2011

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Last modified February 1 04:32 EST 2023. Contains 359981 sequences. (Running on oeis4.)