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A230244 Number of n X n 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero 0

%I #5 Dec 18 2015 18:18:43

%S 0,2,34,18218,38111288,575915716590,57955254721687188

%N Number of n X n 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

%C Diagonal of A230250

%e Some solutions for n=3

%e ..0..3..0....0..1..0....0..3..2....0..1..2....0..1..0....0..3..2....0..1..0

%e ..1..0..1....1..2..1....1..2..1....3..0..3....3..2..1....1..0..3....3..2..3

%e ..2..3..2....2..3..0....0..3..0....2..3..2....2..3..0....2..3..2....2..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 13 2013

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Last modified March 29 08:53 EDT 2024. Contains 371268 sequences. (Running on oeis4.)