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Number of nX7 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1

%I #4 Aug 05 2018 16:00:16

%S 0,22,6,35,74,36,274,280,1065,1939,5947,13101,35847,83062,222994,

%T 537669,1395855,3480819,8943072,22421261,57460156,144954058,369414113,

%U 936279738,2382817938,6046949393,15383924113,39073108671,99355550907,252459496924

%N Number of nX7 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A317741.

%H R. H. Hardin, <a href="/A317740/b317740.txt">Table of n, a(n) for n = 1..210</a>

%H R. H. Hardin, <a href="/A317740/a317740.txt">Empirical recurrence of order 97</a>

%F Empirical recurrence of order 97 (see link above)

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317741.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 05 2018