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A204416 Number of (n+2)X9 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way 1

%I #5 Mar 31 2012 12:37:01

%S 2004465237,2826265830,3619976949,6016853259,8802512928,13168291392,

%T 27153833472,206114865408,2587131767808,13862829908736,

%U 122134679546112,1514872207710720,8036997091598592,70505197603909632,874092505119473664

%N Number of (n+2)X9 0..2 arrays with every 3X3 subblock having three strictly increasing elements in a row horizontally or vertically, exactly one way

%C Column 7 of A204417

%H R. H. Hardin, <a href="/A204416/b204416.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 577*a(n-3) for n>18

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 15 2012

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Last modified April 19 11:14 EDT 2024. Contains 371791 sequences. (Running on oeis4.)