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Number of nX7 0..1 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..1 introduced in row major order
1

%I #4 Apr 09 2014 18:53:19

%S 64,2785,77269,2319211,69637692,2097636322,63213422873,1904782876182,

%T 57392644533582,1729241310772922,52101748475053643,

%U 1569814590240364270,47298161023632144868,1425082784232120727380,42937417098934211565980

%N Number of nX7 0..1 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..1 introduced in row major order

%C Column 7 of A240636

%H R. H. Hardin, <a href="/A240635/b240635.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Apr 09 2014