A205195 - OEIS

%I #5 Mar 31 2012 12:37:05

%S 1720,47900,1256641,25243114,469617426,7313092616,106645806148,

%T 1386271311184,17063356609500,194264369735315,2113694462920360,

%U 21750782413280669,215532030982525812,2048376973087641777

%N Number of (n+1)X3 0..3 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero

%C Column 2 of A205198

%H R. H. Hardin, <a href="/A205195/b205195.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..3..2..1....1..2..1....3..3..0....1..0..1....0..2..2....1..0..3....0..3..0

%e ..1..1..2....1..3..2....1..0..1....0..1..1....1..0..3....3..3..2....2..0..3

%e ..3..2..3....1..3..0....2..3..1....1..1..1....1..2..1....1..3..2....1..3..2

%e ..3..0..1....1..3..2....0..2..1....3..3..0....0..2..2....3..3..3....1..3..1

%e ..2..2..3....1..3..2....2..1..2....3..1..1....1..2..1....2..2..3....1..3..2

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 23 2012