|
%I #5 Mar 31 2012 12:35:53
%S 1970,66658,2235330,75166498,2525447442,84872526674,2852069116186,
%T 95843840904146,3220808030907306,108234716039535994,
%U 3637206631307124730,122227654071983980522,4107437311725265473026,138029661306117738496458
%N Number of (n+1)X4 0..2 arrays with every 2X2 subblock nonsingular
%C Column 3 of A183698
%H R. H. Hardin, <a href="/A183692/b183692.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=17*a(n-1)+526*a(n-2)+1525*a(n-3)-14279*a(n-4)-31924*a(n-5)+135724*a(n-6)+14896*a(n-7)-63104*a(n-8)
%e Some solutions for 3X4
%e ..0..2..2..0....1..0..1..2....0..2..0..2....2..2..1..1....0..2..2..1
%e ..2..0..2..1....2..1..2..2....1..0..2..1....0..2..0..1....2..0..1..2
%e ..1..1..1..1....2..0..1..2....1..2..1..0....1..0..2..0....2..1..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2011
| 