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 A204297 Number of nX4 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order 1

%I

%S 0,16,160,5956,56104,1972288,38262132,826746944,19525910056,

%T 432375489440,9706792686848,218843084884500,4924743527802436,

%U 110797467340650548,2494225116607793984,56147370697399654912,1263637381614193741120

%N Number of nX4 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order

%C Column 4 of A204301

%H R. H. Hardin, <a href="/A204297/b204297.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 14 2012

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Last modified November 26 11:14 EST 2022. Contains 358359 sequences. (Running on oeis4.)