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A210807 Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having two distinct values, and new values 0..2 introduced in lower triangle row major order 1

%I #6 Mar 31 2012 12:37:34

%S 0,11,277,9113,481193,42755401,6567653211,1765418657657,

%T 837299786987585,704286634931475821,1054562224800265182703,

%U 2818631615739460639296059,13476057547647842870829487857,115444002089526684913965405146223

%N Number of (n+1)X(n+1) 0..2 symmetric matrices containing all values 0..2 with every 2X2 subblock having two distinct values, and new values 0..2 introduced in lower triangle row major order

%H R. H. Hardin, <a href="/A210807/b210807.txt">Table of n, a(n) for n = 1..15</a>

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 26 2012

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