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A220038 Number of n X n arrays of the minimum value of corresponding elements and their horizontal, diagonal 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 4,13,184,8337,904715,310371126

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

%C Diagonal of A220044

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 03 2012

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Last modified June 16 07:19 EDT 2024. Contains 373423 sequences. (Running on oeis4.)