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A199361 Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors 0

%I #4 Mar 31 2012 12:36:36

%S 0,5,23,2857,37995,2838998,76784986,4127669738,153225233815

%N Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors

%C Column 4 of A199363

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 05 2011

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)