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A232918 Number of nX6 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally 1

%I #4 Dec 02 2013 14:07:31

%S 96,1080,13992,186720,2515716,33994188,459797904,6221092260,

%T 84180552504,1139126465856,15414771639624,208595002222596,

%U 2822742415594800,38197837835124312,516899809502860032,6994778773839006000

%N Number of nX6 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

%C Column 6 of A232920

%H R. H. Hardin, <a href="/A232918/b232918.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 18*a(n-1) -56*a(n-2) -81*a(n-3) +280*a(n-4) +12*a(n-5) -259*a(n-6) +78*a(n-7) +24*a(n-8) -5*a(n-9)

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 02 2013

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)