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A251435 Number of (n+1)X(1+1) 0..3 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements 1

%I #5 Dec 02 2014 17:51:47

%S 192,2312,27486,327033,3888017,46227589,549607078,6534412622,

%T 77688966462,923660531016,10981592676546,130562451319000,

%U 1552284257397407,18455431860393891,219420485113354861,2608735989678877133

%N Number of (n+1)X(1+1) 0..3 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements

%C Column 1 of A251442

%H R. H. Hardin, <a href="/A251435/b251435.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 11*a(n-1) +20*a(n-2) -109*a(n-3) -48*a(n-4) +138*a(n-5) -46*a(n-6) -68*a(n-7) +48*a(n-8) -7*a(n-9) -9*a(n-10)

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 02 2014

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Last modified April 25 10:39 EDT 2024. Contains 371967 sequences. (Running on oeis4.)