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

%I #4 Aug 06 2018 12:09:28

%S 1,3,5,10,19,40,75,159,310,600,1117,2146,4102,7866,14925,28415,54123,

%T 103279,196740,374715,713672,1359955,2591227,4936722,9404444,17916937,

%U 34135626,65035274

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

%C Diagonal of A317773.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317773.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 06 2018