A304420 - OEIS

%I #6 Sep 16 2020 19:15:19

%S 0,7,124,9304,1712347,898146670,1305482386171,5296781617645719,

%T 59891404546831242351

%N Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304427.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304427.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 12 2018