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A202911 Number of nX3 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor 1

%I #5 Mar 31 2012 12:36:52

%S 64,31984,9509536,2397172032,622483753816,165216756703876,

%T 43681585962838352,11516921180669227688,3038058234902923710566,

%U 801695505848282515899812,211540283503697058778299926

%N Number of nX3 0..7 arrays with every nonzero element less than or equal to some horizontal or vertical neighbor

%C Column 3 of A202916

%H R. H. Hardin, <a href="/A202911/b202911.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..4..6..7....0..7..2....2..1..0....7..3..6....6..3..2....1..6..0....1..5..4

%e ..6..7..7....7..7..3....6..6..3....7..7..6....6..3..1....6..6..0....3..5..3

%e ..6..7..4....5..5..0....4..0..1....3..4..4....1..5..7....1..1..7....5..7..2

%e ..4..5..2....7..7..4....0..3..3....5..5..0....6..6..7....1..2..7....4..7..6

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 26 2011

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Last modified July 18 00:08 EDT 2024. Contains 374377 sequences. (Running on oeis4.)