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A222515 Number of 7Xn 0..1 arrays with exactly floor(7Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

%I A222515 #6 Jul 23 2025 02:42:54
%S A222515 0,144,1335,15420,128889,2220730,19892241,385142640,3707833063,
%T A222515 76288704212,767768563690,16265595620923,167593171246145,
%U A222515 3601551682848558,37565287343451014,813220525871238420
%N A222515 Number of 7Xn 0..1 arrays with exactly floor(7Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.
%C A222515 Row 7 of A222509
%H A222515 R. H. Hardin, <a href="/A222515/b222515.txt">Table of n, a(n) for n = 1..17</a>
%e A222515 Some solutions for n=3
%e A222515 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0
%e A222515 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0
%e A222515 ..0..0..1....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0....0..0..0
%e A222515 ..0..0..0....0..1..0....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0
%e A222515 ..0..0..1....0..1..1....1..0..0....1..0..0....1..0..1....0..1..0....0..0..1
%e A222515 ..0..0..1....1..1..1....0..1..0....0..0..0....0..0..0....0..0..1....0..1..1
%e A222515 ..1..0..0....0..1..1....1..1..1....0..0..1....1..0..0....0..0..1....0..0..1
%K A222515 nonn
%O A222515 1,2
%A A222515 _R. H. Hardin_ Feb 23 2013