A317772 - OEIS

%I #4 Aug 06 2018 12:13:33

%S 21,30,44,32,42,54,75,107,149,221,317,491,739,1157,1774,2819,4306,

%T 6792,10478,16717,25903,41123,63905,101339,158206,252088,395573,

%U 629930,993422,1586551,2503753,3994117,6322941,10097970,15999961,25564515,40566306

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

%C Column 7 of A317773.

%H R. H. Hardin, <a href="/A317772/b317772.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317773.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 06 2018