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 A202130 Number of zero-sum nX1 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor 1

%I #6 Mar 31 2012 12:36:46

%S 0,1,1,7,5,43,43,275,371,1913,3017,14305,25039,109803,212645,866361,

%T 1818147,6992905,15653093,57383555,135498383,477220531,1177254905,

%U 4012238901,10256656225,34031432595,89553075529,290731277941

%N Number of zero-sum nX1 -3..3 arrays with every element equal to at least one horizontal or vertical neighbor

%C Column 1 of A202134

%H R. H. Hardin, <a href="/A202130/b202130.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=8

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

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

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

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

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

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

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

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

%K nonn

%O 1,4

%A _R. H. Hardin_ Dec 11 2011

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Last modified August 10 02:46 EDT 2024. Contains 375044 sequences. (Running on oeis4.)