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%I #6 Mar 31 2012 12:36:01
%S 6891,100941,1451439,19143309,264517911,3635551053,49631761863,
%T 680594596269,9325198131783,127707459851229,1749659420599239,
%U 23968756658981133,328340087728123527,4497988332883770237
%N Number of (n+2)X3 0..2 arrays with each 3X3 subblock singular
%C Column 1 of A184791
%H R. H. Hardin, <a href="/A184787/b184787.txt">Table of n, a(n) for n = 1..200</a>
%F Empirical: a(n)=23*a(n-1)-133*a(n-2)+359*a(n-3)-6981*a(n-4)+44653*a(n-5)-46861*a(n-6)+510397*a(n-7)-3119750*a(n-8)-4266752*a(n-9)-7337146*a(n-10)+97617840*a(n-11)+421337240*a(n-12)+194265216*a(n-13)-2452885280*a(n-14)-11665215256*a(n-15)-13514300128*a(n-16)+36492062528*a(n-17)+161174571904*a(n-18)+234355030272*a(n-19)-208323990528*a(n-20)-1253913449472*a(n-21)-1586195787776*a(n-22)+535347175424*a(n-23)+4616948760576*a(n-24)+4932168384512*a(n-25)-1803615731712*a(n-26)-6148702863360*a(n-27)-2853804441600*a(n-28)
%e Some solutions for 4X3
%e ..1..1..1....0..0..2....1..0..2....1..0..2....1..0..1....2..1..2....2..2..2
%e ..1..0..1....1..0..0....2..0..1....2..2..0....2..0..0....0..1..2....1..1..0
%e ..2..0..2....2..0..0....0..0..0....1..1..0....2..0..0....0..1..2....0..0..0
%e ..1..2..0....2..0..2....2..1..1....0..2..1....1..2..2....1..0..1....0..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 22 2011
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