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A199352 Number of nX3 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 zero or one horizontal or vertical neighbors 1

%I

%S 1,45,930,7945,808721,36379420,821116806,7583425311,911983726469,

%T 45130187288722,1066404844359923,10007712190029813,

%U 1299200253416601860,67226145153865158217,1626281528857502520213,15397791355704316162481

%N Number of nX3 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 zero or one horizontal or vertical neighbors

%C Column 3 of A199356

%H R. H. Hardin, <a href="/A199352/b199352.txt">Table of n, a(n) for n = 1..20</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 05 2011

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Last modified December 6 06:14 EST 2021. Contains 349563 sequences. (Running on oeis4.)