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Number of (n+1)X7 0..2 arrays with every 2X2 subblock nonsingular
1

%I #5 Mar 31 2012 12:35:53

%S 486746,205047906,84872526674,35325040673626,14676897303777902,

%T 6101430466182955346,2535999716660879680590,1054127029029754862576918,

%U 438155240020993469139854206,182123496360117569534537367118

%N Number of (n+1)X7 0..2 arrays with every 2X2 subblock nonsingular

%C Column 6 of A183698

%H R. H. Hardin, <a href="/A183695/b183695.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 3X7

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 06 2011