A304598 - OEIS

%I #6 Sep 16 2020 19:17:15

%S 1,4,13,73,560,6007,75463,1874284,62934491,2085910493,94776909801,

%T 7409071360844,887762245576310

%N Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 5 or 6 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304604.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304604.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 15 2018