A304842 - OEIS

%I #6 Oct 20 2020 19:27:53

%S 1,4,25,132,3009,67025,1500288,105482136,11448808957,1335761507398,

%T 322003120783835

%N Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

%C Diagonal of A304848.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304848.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 19 2018