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Number of (n+1)X6 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero
1

%I #5 Mar 31 2012 12:37:03

%S 2048,21380,157872,1438706,11643054,102186340,852866652,7401341360,

%T 62559638330,541098230290,4603000012148,39777249760844,

%U 339717186256760,2935286205895216,25139048468622558,217230974640825190

%N Number of (n+1)X6 0..2 arrays with the permanents of all 2X2 subblocks equal and nonzero

%C Column 5 of A204840

%H R. H. Hardin, <a href="/A204837/b204837.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 19 2012