A304296 - OEIS

%I #6 Sep 16 2020 19:13:39

%S 0,3,3,4,62,237,2673,47501,555463,25873708,782284349,32914635985,

%T 3458153456492,263002178989873,36033069960036119

%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 5 or 8 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304302.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304302.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 10 2018