%I #6 May 03 2020 15:38:25

%S 0,3,15,30,45,131,181,298,430,1022,1429,2164,2135,4620,3680,9110,

%T 11981,9540,87199,22330,77938,182912,34081

%N Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 king-move adjacent elements, with upper left element zero.

%C Diagonal of A297858.

%e Some solutions for n=7

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

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

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

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

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

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

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

%Y Cf. A297858.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 07 2018