A304340 - OEIS

%I #6 Sep 16 2020 19:14:15

%S 1,4,27,290,6373,135445,4921043,343449680,30008468246,4458350461574

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

%C Diagonal of A304347.

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A304347.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 11 2018