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A186057 Number of (n+2)X5 binary arrays with each 3X3 subblock having a positive determinant 1

%I #5 Mar 31 2012 12:36:04

%S 792,5050,26868,128303,743667,3894282,19416799,109272739,574576902,

%T 2902540637,16077234286,84997177389,432488680193,2368938184744,

%U 12575903584335,64351855121584,349481604164871,1860335476319039

%N Number of (n+2)X5 binary arrays with each 3X3 subblock having a positive determinant

%C Column 3 of A186063

%H R. H. Hardin, <a href="/A186057/b186057.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for 4X5

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 11 2011

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Last modified April 17 20:47 EDT 2024. Contains 371767 sequences. (Running on oeis4.)