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 A206658 Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order 1

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

%S 332419,4345011,67724531,1063970081,17082121522,278034719471,

%T 4505251075150,73239395502901,1194646182327902,19435034147497409,

%U 316401277924997241,5157671463022870073,83984354457026854202

%N Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order

%C Column 7 of A206659

%H R. H. Hardin, <a href="/A206658/b206658.txt">Table of n, a(n) for n = 1..114</a>

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 11 2012

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Last modified August 10 13:02 EDT 2024. Contains 375056 sequences. (Running on oeis4.)