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A186931 Number of (n+1) X (n+1) binary arrays with every 2 X 2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock traces. 0

%I

%S 0,104,1840,59720,3026432,264604776,35582947920,8132915749352,

%T 2989994168957168

%N Number of (n+1) X (n+1) binary arrays with every 2 X 2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2 X 2 subblock traces.

%C Diagonal of A186939.

%e Some solutions for 4 X 4

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

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

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

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

%Y Cf. A186939.

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 01 2011

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Last modified July 1 02:58 EDT 2022. Contains 354947 sequences. (Running on oeis4.)