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A206146 Number of (n+1) X 5 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases. 1

%I #10 Jun 13 2018 14:26:16

%S 486,5118,54450,580986,6204438,66274542,707982258,7563227466,

%T 80796885414,863143206558,9220857727842,98505357616986,

%U 1052321399885238,11241828565189710,120095162925973650,1282962828563896554

%N Number of (n+1) X 5 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.

%C Column 4 of A206150.

%H R. H. Hardin, <a href="/A206146/b206146.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 16*a(n-1) - 65*a(n-2) + 92*a(n-3) - 48*a(n-4) + 8*a(n-5).

%F Empirical g.f.: 6*x*(81 - 443*x + 692*x^2 - 376*x^3 + 64*x^4) / (1 - 16*x + 65*x^2 - 92*x^3 + 48*x^4 - 8*x^5). - _Colin Barker_, Jun 13 2018

%e Some solutions for n=4:

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

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

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

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

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

%Y Cf. A206150.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 04 2012

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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)