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A220003 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 n X n array 0

%I #5 Dec 18 2015 18:18:23

%S 4,7,109,4474,381745,83856137

%N Number of n X n arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 n X n array

%C Diagonal of A220010

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 03 2012

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Last modified April 24 06:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)